Base station apparatus, terminal apparatus, and communication method

ABSTRACT

A terminal apparatus includes a receiver configured to receive a first radio resource control (RRC) parameter for configuring one of a first repetition transmission type and a second repetition transmission type, and a transmitter configured to transmit, on a PUSCH, a transport block scheduled by a DCI format. The transmitter performs, by applying the repetition transmission type configured for the first RRC parameter, a repetition transmission of the transport block.

TECHNICAL FIELD

The present invention relates to a base station apparatus, a terminalapparatus, and a communication method. This application claims prioritybased on JP 2019-2866 filed on Jan. 10, 2019, the contents of which areincorporated herein by reference.

BACKGROUND ART

Technical studies and standardization of Long Term Evolution(LTE)-Advanced Pro and New Radio (NR) technology, as a radio accessscheme and a radio network technology for fifth generation cellularsystems, are currently conducted by the Third Generation PartnershipProject (3GPP) (NPL 1).

The fifth generation cellular system requires three anticipatedscenarios for services: enhanced Mobile BroadBand (eMBB) which realizeshigh-speed, high-capacity transmission, Ultra-Reliable and Low LatencyCommunication (URLLC) which realizes low-latency, high-reliabilitycommunication, and massive Machine Type Communication (mMTC) that allowsa large number of machine type devices to be connected in a system suchas Internet of Things (IoT).

CITATION LIST Non Patent Literature

-   NPL 1: RP-161214, NTT DOCOMO, “Revision of SI: Study on New Radio    Access Technology”, June 2016

SUMMARY OF INVENTION Technical Problem

An object of an aspect of the present invention is to provide a basestation apparatus, a terminal apparatus, and a communication method thatenable efficient communication in a radio communication system as thatdescribed above.

Solution to Problem

(1) In order to achieve the aforementioned object, aspects of thepresent invention provide the following measures. That is, a terminalapparatus according to an aspect of the present invention includes areceiver configured to receive a first radio resource control (RRC)parameter for configuring one of a first repetition transmission typeand a second repetition transmission type, and a transmitter configuredto transmit, on a PUSCH, a transport block scheduled by a DCI format,wherein the transmitter performs, by applying the repetitiontransmission type configured for the first RRC parameter, a repetitiontransmission of the transport block.

(2) A base station apparatus according to an aspect of the presentinvention includes a transmitter configured to transmit a first radioresource control (RRC) parameter for configuring one of a firstrepetition transmission type and a second repetition transmission type,and a receiver configured to receive, on a PUSCH, a transport blockscheduled by a DCI format, wherein the receiver receives, by applyingthe repetition transmission type configured for the first RRC parameter,a repetition transmission of the transport block.

(3) A communication method according to an aspect of the presentinvention is a communication method for a terminal apparatus, the methodincluding receiving a first radio resource control (RRC) parameter forconfiguring one of a first repetition transmission type and a secondrepetition transmission type, transmitting, on a PUSCH, a transportblock scheduled by a DCI format, and performing, by applying therepetition transmission type configured for the first RRC parameter, arepetition transmission of the transport block.

(4) A communication method according to an aspect of the presentinvention is a communication method for a base station apparatus, themethod including transmitting a first radio resource control (RRC)parameter for configuring one of a first repetition transmission typeand a second repetition transmission type, receiving, on a PUSCH, atransport block scheduled by a DCI format, and receiving, by applyingthe repetition transmission type configured for the first RRC parameter,a repetition transmission of the transport block.

Advantageous Effects of Invention

According to an aspect of the present invention, a base stationapparatus and a terminal apparatus can efficiently communicate with eachother.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating a concept of a radio communicationsystem according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of an SS/PBCH block and anSS burst set according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a schematic configuration of an uplinkslot and a downlink slot according to an embodiment of the presentinvention.

FIG. 4 is a diagram illustrating a relationship of a subframe, a slot,and a mini-slot in a time domain according to an embodiment of thepresent invention.

FIG. 5 is a diagram illustrating an example of a slot or a subframeaccording to an embodiment of the present invention.

FIG. 6 is a diagram illustrating an example of beamforming according toan embodiment of the present invention.

FIG. 7 is a diagram illustrating an example of a PDSCH mapping typeaccording to an embodiment of the present invention.

FIG. 8 is a diagram illustrating an example of frequency hoppingaccording to an embodiment of the present invention.

FIG. 9 is a diagram illustrating another example of determination of thenumber of repetition transmissions and the frequency hopping accordingto an embodiment of the present invention.

FIG. 10 is a diagram illustrating definition of which resourceallocation table is applied to PDSCH time domain resource allocationaccording to an embodiment of the present invention.

FIG. 11 is a diagram illustrating an example of a default table Aaccording to an embodiment of the present invention.

FIG. 12 is a diagram illustrating an example of a default table Baccording to an embodiment of the present invention.

FIG. 13 is a diagram illustrating an example of a default table Caccording to an embodiment of the present invention.

FIG. 14 is a diagram illustrating an example in which SLIV is calculatedaccording to an embodiment of the present invention.

FIG. 15 is a diagram illustrating an example of a redundancy versionapplied to a transmission occasion according to the present embodiment.

FIG. 16 is a diagram illustrating definition of which resourceallocation table is applied to PUSCH time domain resource allocationaccording to the present embodiment.

FIG. 17 is a diagram illustrating an example of a PUSCH default table Aaccording to the present embodiment.

FIG. 18 is a diagram illustrating another example of determination ofthe number of repetition transmissions and frequency hopping accordingto the present embodiment.

FIG. 19 is a diagram illustrating another example of the determinationof the number of repetition transmissions and the frequency hoppingaccording to an embodiment of the present invention.

FIG. 20 is a diagram illustrating another example of the number ofrepetition transmissions and the frequency hopping according to thepresent embodiment.

FIG. 21 is a diagram illustrating an example of slot aggregationtransmission according to an embodiment of the present invention.

FIG. 22 is a schematic block diagram illustrating a configuration of aterminal apparatus 1 according to an embodiment of the presentinvention.

FIG. 23 is a schematic block diagram illustrating a configuration of abase station apparatus 3 according to an embodiment of the presentinvention.

DESCRIPTION OF EMBODIMENTS

Embodiments of the present invention will be described below.

FIG. 1 is a conceptual diagram of a radio communication system accordingto the present embodiment. In FIG. 1, the radio communication systemincludes a terminal apparatus 1A, a terminal apparatus 1B, and a basestation apparatus 3. The terminal apparatus 1A and the terminalapparatus 1B are also referred to as a terminal apparatus 1 below.

The terminal apparatus 1 is also called a user terminal, a mobilestation device, a communication terminal, a mobile device, a terminal,User Equipment (UE), and a Mobile Station (MS). The base stationapparatus 3 is also referred to as a radio base station apparatus, abase station, a radio base station, a fixed station, a NodeB (NB), anevolved NodeB (eNB), a Base Transceiver Station (BTS), a Base Station(BS), an NR NodeB (NR NB), NNB, a Transmission and Reception Point(TRP), or gNB. The base station apparatus 3 may include a core networkapparatus. Furthermore, the base station apparatus 3 may include one ormultiple transmission reception points (TRPs) 4. At least some of thefunctions/processing of the base station apparatus 3 described below maybe the functions/processing of each of the transmission reception points4 included in the base station apparatus 3. The base station apparatus 3may use a communicable range (communication area) controlled by the basestation apparatus 3, as one or multiple cells to serve the terminalapparatus 1. Furthermore, the base station apparatus 3 may use acommunicable range (communication area) controlled by one or multipletransmission reception points 4, as one or multiple cells to serve theterminal apparatus 1. Furthermore, one cell may be divided into multiplebeamed areas, and the terminal apparatus 1 may be served in each of thebeamed areas. Here, a beamed area may be identified based on a beamindex used for beamforming or a precoding index.

A radio communication link from the base station apparatus 3 to theterminal apparatus 1 is referred to as a downlink. A radio communicationlink from the terminal apparatus 1 to the base station apparatus 3 isreferred to as an uplink.

In FIG. 1, in a radio communication between the terminal apparatus 1 andthe base station apparatus 3, Orthogonal Frequency Division Multiplexing(OFDM) including a Cyclic Prefix (CP), Single-Carrier Frequency DivisionMultiplexing (SC-FDM), Discrete Fourier Transform Spread OFDM(DFT-S-OFDM), or Multi-Carrier Code Division Multiplexing (MC-CDM) maybe used.

Furthermore, in FIG. 1, in the radio communication between the terminalapparatus 1 and the base station apparatus 3, Universal-FilteredMulti-Carrier (UFMC), Filtered OFDM (F-OFDM), Windowed OFDM, orFilter-Bank Multi-Carrier (FBMC) may be used.

Note that the present embodiment will be described in conjunction withOFDM symbols with the assumption that OFDM is used as a transmissionscheme but that use of any other transmission scheme is also included inthe present invention.

Furthermore, in FIG. 1, in the radio communication between the terminalapparatus 1 and the base station apparatus 3, the CP need not be used,or the above-described transmission scheme with zero padding may be usedinstead of the CP. Moreover, the CP or zero passing may be added bothforward and backward.

An aspect of the present embodiment may be operated in carrieraggregation or dual connectivity with the Radio Access Technologies(RAT) such as LTE and LTE-A/LTE-A Pro. In this case, the aspect may beused for some or all of the cells or cell groups, or the carriers orcarrier groups (e.g., Primary Cells (PCells), Secondary Cells (SCells),Primary Secondary Cells (PSCells), Master Cell Groups (MCGs), orSecondary Cell Groups (SCGs)). Moreover, the aspect may be independentlyoperated and used in a stand-alone manner. In the dual connectivityoperation, the Special Cell (SpCell) is referred to as a PCell of theMCG or a PSCell of the SCG, respectively, depending on whether a MediumAccess Control (MAC) entity is associated with the MCG or the SCG. In acase that the operation is not in dual connectivity, the Special Cell(SpCell) is referred to as a PCell. The Special Cell (SpCell) supportsPUCCH transmission and contention based random access.

In the present embodiment, one or multiple serving cells may beconfigured for the terminal apparatus 1. The multiple serving cellsconfigured may include one primary cell and one or multiple secondarycells. The primary cell may be a serving cell on which an initialconnection establishment procedure has been performed, a serving cell inwhich a connection re-establishment procedure has been initiated, or acell indicated as a primary cell in a handover procedure. One ormultiple secondary cells may be configured at a point of time in a casethat or after a Radio Resource Control (RRC) connection is established.Note that the multiple serving cells configured may include one primarysecondary cell. The primary secondary cell may be a secondary cell thatis included in the one or multiple secondary cells configured and inwhich the terminal apparatus 1 can transmit control information in theuplink. Additionally, subsets of two types of serving cellscorresponding to a master cell group and a secondary cell group may beconfigured for the terminal apparatus 1. The master cell group mayinclude one primary cell and zero or more secondary cells. The secondarycell group may include one primary secondary cell and zero or moresecondary cells.

Time Division Duplex (TDD) and/or Frequency Division Duplex (FDD) may beapplied to the radio communication system according to the presentembodiment. The Time Division Duplex (TDD) scheme or the FrequencyDivision Duplex (FDD) scheme may be applied to all of the multiplecells. Cells to which the TDD scheme is applied and cells to which theFDD scheme is applied may be aggregated. The TDD scheme may be referredto as an unpaired spectrum operation. The FDD scheme may be referred toas a paired spectrum operation.

A carrier corresponding to a serving cell in the downlink is referred toas a downlink component carrier (or a downlink carrier). A carriercorresponding to a serving cell in the uplink is referred to as anuplink component carrier (or an uplink carrier). A carrier correspondingto a serving cell in the sidelink is referred to as a sidelink componentcarrier (or a sidelink carrier). The downlink component carrier, theuplink component carrier, and/or the sidelink component carrier arecollectively referred to as a component carrier (or a carrier).

Physical channels and physical signals according to the presentembodiment will be described.

In FIG. 1, the following physical channels are used for the radiocommunication between the terminal apparatus 1 and the base stationapparatus 3.

-   -   Physical Broadcast CHannel (PBCH)    -   Physical Downlink Control CHannel (PDCCH)    -   Physical Downlink Shared CHannel (PDSCH)    -   Physical Uplink Control CHannel (PUCCH)    -   Physical Uplink Shared CHannel (PUSCH)    -   Physical Random Access CHannel (PRACH)

The PBCH is used to broadcast essential information block ((MasterInformation Block (MIB), Essential Information Block (EIB), andBroadcast Channel (BCH)) which includes essential system informationneeded by the terminal apparatus 1.

The PBCH may be used to broadcast time indexes within the period ofsynchronization signal blocks (also referred to as SS/PBCH blocks).Here, the time index is information indicating the indexes of thesynchronization signals and the PBCHs within the cell. For example, in acase that the SS/PBCH block is transmitted using the assumption of threetransmission beams (transmission filter configuration and QuasiCo-Location (QCL) related to reception spatial parameters), the order oftime within a prescribed period or within a configured period may beindicated. Additionally, the terminal apparatus may recognize thedifference in time index as a difference in transmission beam.

The PDCCH is used to transmit (or carry) downlink control information(DCI) in a case of downlink radio communication (radio communicationfrom the base station apparatus 3 to the terminal apparatus 1). Here,one or multiple pieces of DCI (which may be referred to as DCI formats)are defined for transmission of the downlink control information. Inother words, a field for the downlink control information is defined asDCI and is mapped to information bits. The PDCCH is transmitted in aPDCCH candidate. The terminal apparatus 1 monitors a set of PDCCHcandidates in the serving cell. The monitoring means an attempt todecode the PDCCH in accordance with a certain DCI format.

For example, the following DCI format may be defined.

-   -   DCI format 0_0    -   DCI format 0_1    -   DCI format 1_0    -   DCI format 1_1    -   DCI format 2_0    -   DCI format 2_1    -   DCI format 2_2    -   DCI format 2_3

DCI format 0_0 may be used for scheduling of the PUSCH in a certainserving cell. DCI format 0_0 may include information indicating PUSCHscheduling information (frequency domain resource allocation and timedomain resource allocation). DCI format 0_0 may additionally include aCRC scrambled with any one of the C-RNTI, the CS-RNTI, the MCS-C-RNTI,and/or the TC-RNTI. DCI format 0_0 may be monitored in a common searchspace or a UE-specific search space.

DCI format 0_1 may be used for scheduling of the PUSCH in a certainserving cell. DCI format 0_1 may include information indicating PUSCHscheduling information (frequency domain resource allocation and timedomain resource allocation), information indicating a Bandwidth Part(BWP), a Channel State Information (CSI) request, a Sounding ReferenceSignal (SRS) request, and information related to antenna ports. DCIformat 0_1 may additionally include a CRC scrambled with any one of theC-RNTI, the CS-RNTI, the SP-CSI-RNTI, and/or the MCS-C-RNTI. DCI format0_1 may be monitored in the UE-specific search space.

DCI format 1_0 may be used for scheduling of the PDSCH in a certainserving cell. DCI format 1_0 may include information indicating PDSCHscheduling information (frequency domain resource allocation and timedomain resource allocation). DCI format 1_0 may additionally include aCRC scrambled with any one of the C-RNTI, the CS-RNTI, the MCS-C-RNTI, aP-RNTI, an SI-RNTI, an RA-RNTI, and/or a TC-RNTI. DCI format 1_0 may bemonitored in the common search space or the UE-specific search space.

DCI format 1_1 may be used for scheduling of the PDSCH in a certainserving cell. DCI format 1_1 may include information indicating PDSCHscheduling information (frequency domain resource allocation and timedomain resource allocation), information indicating a bandwidth part(BWP), transmission configuration indication (TCI), and informationrelated to the antenna ports. DCI format 1_1 may additionally include aCRC scrambled with any one of the C-RNTI, the CS-RNTI, and/or theMCS-C-RNTI. DCI format 1_1 may be monitored in the UE-specific searchspace.

DCI format 2_0 is used to notify the slot format of one or multipleslots. The slot format is defined as a format in which each OFDM symbolin the slot is classified as downlink, flexible, or uplink. For example,in a case that the slot format is 28, DDDDDDDDDDDDFU is applied to the14 OFDM symbols in the slot for which slot format 28 is indicated. Here,D is a downlink symbol, F is a flexible symbol, and U is an uplinksymbol. Note that the slot will be described below.

DCI format 2_1 is used to notify the terminal apparatus 1 of physicalresource blocks and OFDM symbols which may be assumed to involve notransmission. Note that this information may be referred to as apre-emption indication (intermittent transmission indication).

DCI format 2_2 is used for transmission of the PUSCH and a TransmitPower Control (TPC) command for the PUSCH.

DCI format 2_3 is used to transmit a group of TPC commands fortransmission of sounding reference signals (SRSs) by one or multipleterminal apparatuses 1. Additionally, the SRS request may be transmittedalong with the TPC command. In addition, the SRS request and the TPCcommand may be defined in the DCI format 2_3 for uplink with no PUSCHand PUCCH or uplink in which the transmit power control for the SRS isnot associated with the transmit power control for the PUSCH.

Here, the DCI for the downlink is also referred to as downlink grant ordownlink assignment. Here, the DCI for the uplink is also referred to asuplink grant or uplink assignment. The DCI may also be referred to as aDCI format.

The Cyclic Redundancy Check (CRC) parity bits added to the DCI formattransmitted on one PDCCH are scrambled with a System Information-RadioNetwork Temporary Identifier (SI-RNTI), a Paging-Radio Network TemporaryIdentifier (P-RNTI), a Cell-Radio Network Temporary Identifier (C-RNTI),a Configured Scheduling-Radio Network Temporary Identifier (CS-RNTI), aRandom Access-Radio Network Temporary Identity (RA-RNTI), or a TemporaryC-RNTI. The SI-RNTI may be an identifier used for broadcasting of thesystem information. The P-RNTI may be an identifier used for paging andnotification of system information modification. The C-RNTI, theMCS-C-RNTI, and the CS-RNTI are identifiers for identifying a terminalapparatus within a cell. The Temporary C-RNTI is an identifier foridentifying the terminal apparatus 1 that has transmitted a randomaccess preamble during a contention based random access procedure.

The C-RNTI (identifier (identification information) of terminalapparatus) is used to control the PDSCH or the PUSCH in one or multipleslots. The CS-RNTI is used to periodically allocate a resource for thePDSCH or the PUSCH. The MCS-C-RNTI is used to indicate the use of aprescribed MCS table for grant-based transmission. The Temporary C-RNTI(TC-RNTI) is used to control PDSCH transmission or PUSCH transmission inone or multiple slots. The Temporary C-RNTI is used to schedulere-transmission of a random access message 3 and transmission of arandom access message 4. The RA-RNTI (random access responseidentification information) is determined in accordance with frequencyand time position information regarding the physical random accesschannel on which the random access preamble has been transmitted.

The PUCCH is used to transmit Uplink Control Information (UCI) in a caseof uplink radio communication (radio communication from the terminalapparatus 1 to the base station apparatus 3). Here, the uplink controlinformation may include Channel State Information (CSI) used to indicatea downlink channel state. The uplink control information may includeScheduling Request (SR) used to request an UL-SCH resource. The uplinkcontrol information may include a Hybrid Automatic Repeat requestACKnowledgement (HARQ-ACK). The HARQ-ACK may indicate an HARQ-ACK fordownlink data (Transport block, Medium Access Control Protocol Data Unit(MAC PDU), or Downlink-Shared CHannel (DL-SCH)).

The PDSCH is used to transmit downlink data (Downlink Shared CHannel(DL-SCH)) from a Medium Access Control (MAC) layer. Furthermore, in acase of the downlink, the PSCH is used to transmit System Information(SI), a Random Access Response (RAR), and the like.

The PUSCH may be used to transmit uplink data (UpLink-Shared CHannel(UL-SCH)) from the MAC layer or to transmit the HARQ-ACK and/or CSIalong with the uplink data. Furthermore, the PSCH may be used totransmit the CSI only or the HARQ-ACK and CSI only. In other words, thePSCH may be used to transmit the UCI only.

Here, the base station apparatus 3 and the terminal apparatus 1 exchange(transmit and/or receive) signals with each other in higher layers. Forexample, the base station apparatus 3 and the terminal apparatus 1 maytransmit and/or receive Radio Resource Control (RRC) signaling (alsoreferred to as a Radio Resource Control (RRC) message or Radio ResourceControl (RRC) information) in an RRC layer. The base station apparatus 3and the terminal apparatus 1 may transmit and/or receive a Medium AccessControl (MAC) control element in a Medium Access Control (MAC) layer.Additionally, the RRC layer of the terminal apparatus 1 acquires systeminformation broadcast from the base station apparatus 3. In this regard,the RRC signaling, the system information, and/or the MAC controlelement is also referred to as higher layer signaling or a higher layerparameter. The higher layer as used herein means a higher layer asviewed from the physical layer, and thus may include one or multiple ofthe MAC layer, the RRC layer, an RLC layer, a PDCP layer, a Non AccessStratum (NAS) layer, and the like. For example, in the processing of theMAC layer, the higher layer may include one or multiple of the RRClayer, the RLC layer, the PDCP layer, the NAS layer, and the like.Hereinafter, “A is given in the higher layer” or “A is given by thehigher layer” may mean that the higher layer (mainly the RRC layer, theMAC layer, or the like) of the terminal apparatus 1 receives A from thebase station apparatus 3 and that A received is provided from the higherlayer of the terminal apparatus 1 to the physical layer of the terminalapparatus 1. Configuring a higher layer parameter for the terminalapparatus 1 may mean that the higher layer parameter is provided to theterminal apparatus.

The PDSCH or the PUSCH may be used to transmit the RRC signaling and theMAC control element. In this regard, in the PDSCH, the RRC signalingtransmitted from the base station apparatus 3 may be signaling common tomultiple terminal apparatuses 1 in a cell. The RRC signaling transmittedfrom the base station apparatus 3 may be dedicated signaling for acertain terminal apparatus 1 (also referred to as dedicated signaling).In other words, terminal apparatus-specific (UE-specific) informationmay be transmitted through dedicated signaling to the certain terminalapparatus 1. Additionally, the PUSCH may be used to transmit UEcapabilities in the uplink.

In FIG. 1, the following downlink physical signals are used for downlinkradio communication. Here, the downlink physical signals are not used totransmit information output from the higher layers but are used by thephysical layer.

-   -   Synchronization signal (SS)    -   Reference Signal (RS)

The synchronization signal may include a Primary Synchronization Signal(PSS) and a Secondary Synchronization Signal (SSS). A cell ID may bedetected by using the PSS and SSS.

The synchronization signal is used for the terminal apparatus 1 toestablish synchronization in a frequency domain and a time domain in thedownlink. Here, the synchronization signal may be used for the terminalapparatus 1 to select precoding or a beam in precoding or beamformingperformed by the base station apparatus 3. Note that the beam may bereferred to as a transmission or reception filter configuration, or aspatial domain transmission filter or a spatial domain reception filter.

A reference signal is used for the terminal apparatus 1 to performchannel compensation on a physical channel Here, the reference signal isused for the terminal apparatus 1 to calculate the downlink CSI.Furthermore, the reference signal may be used for a numerology such as aradio parameter or subcarrier spacing, or used for fine synchronizationthat allows FFT window synchronization to be achieved.

According to the present embodiment, at least one of the followingdownlink reference signals are used.

-   -   Demodulation Reference Signal (DMRS)    -   Channel State Information Reference Signal (CSI-RS)    -   Phrase Tracking Reference Signal (PTRS)    -   Tracking Reference Signal (TRS)

The DMRS is used to demodulate a modulated signal. Note that two typesof reference signals may be defined as the DMRS: a reference signal fordemodulating the PBCH and a reference signal for demodulating the PDSCHor that both reference signals may be referred to as the DMRS. TheCSI-RS is used for measurement of Channel State Information (CSI) andbeam management, and a transmission method for a periodic,semi-persistent, or aperiodic CSI reference signal is applied to theCSI-RS. For the CSI-RS, a Non-Zero Power (NZP) CSI-RS and a CSI-RS withzero transmit power (or receive power) (Zero Power (ZP)) may be defined.Here, the ZP CSI-RS may be defined as a CSI-RS resource that has zerotransmit power or that is not transmitted. The PTRS is used to trackphase on the time axis to ensure frequency offset caused by phase noise.The TRS is used to ensure Doppler shift during fast movement. Note thatthe TRS may be used as one configuration of the CSI-RS. For example, aradio resource may be configured with the CSI-RS for one port as a TRS.

According to the present embodiment, one or multiple of the followinguplink reference signals are used.

-   -   Demodulation Reference Signal (DMRS)    -   Phase Tracking Reference Signal (PTRS)    -   Sounding Reference Signal (SRS)

The DMRS is used to demodulate a modulated signal. Note that two typesof reference signals may be defined as the DMRS: a reference signal fordemodulating the PUCCH and a reference signal for demodulating the PUSCHor that both reference signals may be referred to as the DMRS. The SRSis used for measurement of uplink channel state information (CSI),channel sounding, and beam management. The PTRS is used to track phaseon the time axis to ensure frequency offset caused by phase noise.

The downlink physical channels and/or the downlink physical signals arecollectively referred to as a downlink signal. The uplink physicalchannels and/or the uplink physical signals are collectively referred toas an uplink signal. The downlink physical channels and/or the uplinkphysical channels are collectively referred to as a physical channel.The downlink physical signals and/or the uplink physical signals arecollectively referred to as a physical signal.

The BCH, the UL-SCH, and the DL-SCH are transport channels. A channelused in the Medium Access Control (MAC) layer is referred to as atransport channel. A unit of the transport channel used in the MAC layeris also referred to as a Transport Block (TB) and/or a MAC Protocol DataUnit (PDU). A Hybrid Automatic Repeat reQuest (HARQ) is controlled foreach transport block in the MAC layer. The transport block is a unit ofdata that the MAC layer delivers to the physical layer. In the physicallayer, the transport block is mapped to a codeword, and codingprocessing is performed for each codeword.

FIG. 2 is a diagram illustrating an example of SS/PBCH blocks (alsoreferred to as synchronization signal blocks, SS blocks, and SSBs) andSS burst sets (also referred to as synchronization signal burst sets)according to the present embodiment. FIG. 2 illustrates an example inwhich two SS/PBCH blocks are included in a periodically transmitted SSburst set, and the SS/PBCH block includes continuous four OFDM symbols.

The SS/PBCH block is a unit block including at least synchronizationsignals (PSS, SSS) and/or PBCHs. Transmitting the signals/channelsincluded in the SS/PBCH block is described as transmitting the SS/PBCHblock. In a case of transmitting the synchronization signals and/or thePBCHs using one or multiple SS/PBCH blocks in the SS burst set, the basestation apparatus 3 may use an independent downlink transmission beamfor each SS/PBCH block.

In FIG. 2, PSS, SSS, and PBCHs are time/frequency multiplexed in oneSS/PBCH block. However, the order in which the PSS, the SSS, and/or thePBCHs are multiplexed in the time domain may be different from the orderin the example illustrated in FIG. 2.

The SS burst set may be transmitted periodically. For example, a periodused for initial access and a period configured for a connected(Connected or RRC_Connected) terminal apparatus may be defined.Furthermore, the period configured for the connected (Connected orRRC_Connected) terminal apparatus may be configured in the RRC layer.Additionally, the period configured for the connected (Connected orRRC_Connected) terminal may be a period of a radio resource in the timedomain during which transmission is potentially to be performed, and inpractice, whether the transmission is to be performed during the periodmay be determined by the base station apparatus 3. Furthermore, theperiod used for the initial access may be predefined in specificationsor the like.

The SS burst set may be determined based on a System Frame Number (SFN).Additionally, a start position of the SS burst set (boundary) may bedetermined based on the SFN and the period.

The SS/PBCH block is assigned with an SSB index (which may be referredto as the SSB/PBCH block index) depending on the temporal position inthe SS burst set. The terminal apparatus 1 calculates the SSB index,based on the information of the PBCH and/or the information of thereference signal included in the detected SS/PBCH block.

The SS/PBCH blocks with the same relative time in each SS burst set inthe multiple SS burst sets are assigned with the same SSB index. TheSS/PBCH blocks with the same relative time in each SS burst set in themultiple SS burst sets may be assumed to be QCLed (or the same downlinktransmission beam may be assumed to be applied to these SS/PBCH blocks).In addition, antenna ports in the SS/PBCH blocks with the same relativetime in each SS burst set in the multiple SS burst sets may be assumedto be QCLed for average delay, Doppler shift, and spatial correlation.

Within a certain SS burst set period, the SS/PBCH block assigned withthe same SSB index may be assumed to be QCLed for average delay, averagegain, Doppler spread, Doppler shift, and spatial correlation. Aconfiguration corresponding to one or multiple SS/PBCH blocks (or theSS/PBCH blocks may be reference signals) that are QCLed may be referredto as a QCL configuration.

The number of SS/PBCH blocks (which may be referred to as the number ofSS blocks or the SSB number) may be defined as, for example, the numberof SS/PBCH blocks within an SS burst, an SS burst set, or an SS/PBCHblock period. Additionally, the number of SS/PBCH blocks may indicatethe number of beam groups for cell selection within the SS burst, the SSburst set, or the SS/PBCH block period. Here, the beam group may bedefined as the number of different SS/PBCH blocks or the number ofdifferent beams included in the SS burst, the SS burst set, or theSS/PBCH block period.

Hereinafter, the reference signal described in the present embodimentincludes a downlink reference signal, a synchronization signal, anSS/PBCH block, a downlink DM-RS, a CSI-RS, an uplink reference signal,an SRS, and/or an uplink DM-RS. For example, the downlink referencesignal, the synchronization signal, and/or the SS/PBCH block may bereferred to as a reference signal. The reference signals used in thedownlink include a downlink reference signal, a synchronization signal,an SS/PBCH block, a downlink DM-RS, a CSI-RS, and the like. Thereference signals used in the uplink include an uplink reference signal,an SRS and/or an uplink DM-RS, and the like.

The reference signal may also be used for Radio Resource Measurement(RRM). The reference signal may also be used for beam management.

Beam management may be a procedure of the base station apparatus 3and/or the terminal apparatus 1 for matching directivity of an analogand/or digital beam in a transmission apparatus (the base stationapparatus 3 in the downlink and the terminal apparatus 1 in the uplink)with directivity of an analog and/or digital beam in a receptionapparatus (the terminal apparatus 1 in the downlink and the base stationapparatus 3 in the uplink) to acquire a beam gain.

Note that the procedures described below may be included as a procedurefor configuring, setting, or establishing a beam pair link.

-   -   Beam selection    -   Beam refinement    -   Beam recovery

For example, the beam selection may be a procedure for selecting a beamin communication between the base station apparatus 3 and the terminalapparatus 1. Furthermore, the beam refinement may be a procedure forselecting a beam having a higher gain or changing a beam to an optimumbeam between the base station apparatus 3 and the terminal apparatus 1according to the movement of the terminal apparatus 1. The beam recoverymay be a procedure for re-selecting the beam in a case that the qualityof a communication link is degraded due to blockage caused by a blockingobject, a passing human being, or the like in communication between thebase station apparatus 3 and the terminal apparatus 1.

Beam management may include beam selection and beam refinement. Notethat the beam recovery may include the following procedures.

-   -   Detection of beam failure    -   Discovery of a new beam    -   Transmission of a beam recovery request    -   Monitoring of a response to the beam recovery request

For example, the Reference Signal Received Power (RSRP) of the SSSincluded in the CSI-RS or the SS/PBCH block may be used or a CSI may beused in selecting the transmission beam of the base station apparatus 3at the terminal apparatus 1. Additionally, as a report to the basestation apparatus 3, the CSI-RS Resource Index (CRI) may be used, or anindex indicated in the PBCHs included in the SS/PBCH block and/or in asequence of demodulation reference signals (DMRSs) used for demodulationof the PBCHs may be used.

Additionally, the base station apparatus 3 indicates the CRI or the timeindex of the SS/PBCH in indicating the beam to the terminal apparatus 1,and the terminal apparatus 1 receives the beam, based on the CRI or thetime index of the SS/PBCH that is indicated. At this time, the terminalapparatus 1 may configure a spatial filter, based on the CRI or the timeindex of the SS/PBCH that is indicated, and receive the beam.Additionally, the terminal apparatus 1 may receive the beam by using theassumption of Quasi Co-Location (QCL). One signal (such as an antennaport, a synchronization signal, a reference signal, etc.) being “QCLed”with another signal (such as an antenna port, a synchronization signal,a reference signal, etc.) or “using the assumption of QCL” for thesesignals can be interpreted as the one signal being associated with theother signal.

In a case that a long term property of a channel on which one symbol inone antenna port is carried may be estimated from a channel on which onesymbol in the other antenna port is carried, the two antenna ports aresaid to be quasi co-located (QCLed). The long term property of thechannel includes at least one of a delay spread, a Doppler spread, aDoppler shift, an average gain, or an average delay. For example, in acase that an antenna port 1 and an antenna port 2 are quasi co-located(QCLed) with respect to the average delay, this means that a receptiontiming for the antenna port 2 may be estimated from a reception timingfor the antenna port 1.

The QCL may also be expanded to beam management. For this purpose,spatially expanded QCL may be newly defined. For example, the long termproperty of a channel in spatial QCL assumption may be an Angle ofArrival (AoA), a Zenith angle of Arrival (ZoA), or the like and/or anangle spread, for example, Angle Spread of Arrival (ASA) or a Zenithangle Spread of Arrival (ZSA), a transmission angle (AoD, ZoD, or thelike) or an angle spread of the transmission angle, for example, anAngle Spread of Departure (ASD) or a Zenith angle Spread of Departure(ZSD), or Spatial Correlation, or a reception spatial parameter in aradio link or channel.

For example, in a case that the antenna port 1 and the antenna port 2may be considered to be QCLed with respect to a reception spatialparameter, this means that a reception beam (reception spatial filter)in which a signal from the antenna port 2 is received may be inferredfrom a reception beam in which a signal from the antenna port 1 isreceived.

As QCL types, combinations of long term properties that may beconsidered to be QCLed may be defined. For example, the following typesmay be defined.

-   -   Type A: Doppler shift, Doppler spread, average delay, delay        spread    -   Type B: Doppler shift, Doppler spread    -   Type C: Average delay, Doppler shift    -   Type D: Reception spatial parameter

The above-described QCL types may configure and/or indicate theassumption of QCL of the one or two reference signals and the PDCCH orthe PDSCH DMRS in the RRC and/or MAC layer and/or DCI as a TransmissionConfiguration Indication (TCI). For example, in a case that the index #2of the SS/PBCH block and the QCL type A+QCL type B are configured and/orindicated as one state of the TCI in a case that the terminal apparatus1 receives the PDCCH, then at the time of reception of the PDCCH DMRS,the terminal apparatus 1 may receive the PDCCH DMRS and performsynchronization and channel estimation, with the Doppler shift, Dopplerspread, average delay, delay spread, and reception spatial parameter inthe reception of SS/PBCH block index #2 considered as the long termproperties of the channels. At this time, the reference signal (in theexample described above, the SS/PBCH block) indicated by the TCI may bereferred to as a source reference signal, and the reference signal (inthe above-described example, the PDCCH DMRS) affected by the long termproperty inferred from the long term property of the channel in a casethat the source reference signal is received may be referred to as atarget reference signal. Additionally, for the TCI, the RRC configuresone or multiple TCI states and a combination of the source referencesignal and the QCL type for each state, and the TCI may be indicated tothe terminal apparatus 1 by using the MAC layer or DCI.

According to this method, operations of the base station apparatus 3 andthe terminal apparatus 1 equivalent to beam management may be definedbased on the QCL assumption for the spatial domain and radio resources(time and/or frequency) as beam management and beam indication/report.

The subframe will now be described. The subframe in the presentembodiment may also be referred to as a resource unit, a radio frame, atime period, or a time interval.

FIG. 3 is a diagram illustrating a general configuration of an uplinkand a downlink slots according to a first embodiment of the presentinvention. Each of the radio frames is 10 ms in length. Additionally,each of the radio frames includes 10 subframes and W slots. In addition,one slot includes X OFDM symbols. In other words, the length of onesubframe is 1 ms. For each of the slots, time length is defined based onsubcarrier spacings. For example, in a case that the subcarrier spacingof an OFDM symbol is 15 kHz and Normal Cyclic Prefixes (NCPs) are used,X=7 or X=14, and X=7 corresponds to 0.5 ms and X=14 corresponds to 1 ms.In addition, in a case that the subcarrier spacing is 60 kHz, X=7 orX=14, and X=7 and X=14 correspond to 0.125 ms and 0.25 ms, respectively.Additionally, for example, for X=14, W=10 in a case that the subcarrierspacing is 15 kHz, and W=40 in a case that the subcarrier spacing is 60kHz. FIG. 3 illustrates a case of X=7 as an example. Note that a case ofX=14 can be similarly configured by expanding the case of X=7.Furthermore, the uplink slot is defined similarly, and the downlink slotand the uplink slot may be defined separately. Additionally, thebandwidth of the cell of FIG. 3 may also be defined as a part of theband (BandWidth Part (BWP)). In addition, the slot may be referred to asa Transmission Time Interval (TTI). The slot need not be defined as aTTI. The TTI may be a transmission period for transport blocks.

The signal or the physical channel transmitted in each of the slots maybe represented by a resource grid. The resource grid is defined bymultiple subcarriers and multiple OFDM symbols for each numerology(subcarrier spacing and cyclic prefix length) and for each carrier. Thenumber of subcarriers constituting one slot depends on each of thedownlink and uplink bandwidths of a cell. Each element in the resourcegrid is referred to as a resource element. The resource element may beidentified by using a subcarrier number and an OFDM symbol number.

The resource grid is used to represent mapping of a certain physicaldownlink channel (such as the PDSCH) or a certain physical uplinkchannel (such as the PUSCH) to resource elements. For example, for asubcarrier spacing of 15 kHz, in a case that the number X of OFDMsymbols included in a subframe is 14 and NCPs are used, one physicalresource block is defined by 14 continuous OFDM symbols in the timedomain and by 12*Nmax continuous subcarriers in the frequency domain.Nmax is the maximum number of resource blocks determined by a subcarrierspacing configuration μ described below. In other words, the resourcegrid includes (14*12*Nmax, μ) resource elements. Extended CPs (ECPs) aresupported only at a subcarrier spacing of 60 kHz, and thus one physicalresource block is defined by 12 (the number of OFDM symbols included inone slot)*4 (the number of slots included in one subframe) in the timedomain=48 continuous OFDM symbols, 12*Nmax, μ continuous subcarriers inthe frequency domain, for example. In other words, the resource gridincludes (48*12*Nmax, μ) resource elements.

As resource blocks, a reference resource block, a common resource block,a physical resource block, and a virtual resource block are defined. Oneresource block is defined as 12 subcarriers that are continuous in thefrequency domain. Reference resource blocks are common to allsubcarriers, and for example, resource blocks may be configured at asubcarrier spacing of 15 kHz and may be numbered in ascending order.Subcarrier index 0 at reference resource block index 0 may be referredto as reference point A (point A) (which may simply be referred to as a“reference point”). The common resource blocks are resource blocksnumbered in ascending order from 0 at each subcarrier spacingconfiguration μ starting at the reference point A. The resource griddescribed above is defined by the common resource blocks. The physicalresource blocks are resource blocks numbered in ascending order from 0included in a bandwidth part (BWP) described below, and the physicalresource blocks are resource blocks numbered in ascending order from 0included in the bandwidth part (BWP). A certain physical uplink channelis first mapped to a virtual resource block. Thereafter, the virtualresource block is mapped to a physical resource block. Hereinafter, theresource block may be a virtual resource block, a physical resourceblock, a common resource block, or a reference resource block.

Now, the subcarrier spacing configuration μ will be described. Asdescribed above, one or multiple OFDM numerologies are supported in NR.In a certain BWP, the subcarrier spacing configuration μ (μ=0, 1, . . .5) and the cyclic prefix length are given for a downlink BWP by thehigher layer and for an uplink BWP by the higher layer. In this regard,given μ, a subcarrier spacing Δf is given by Δf=2{circumflex over( )}μ*15 (kHz).

At the subcarrier spacing configuration μ, the slots are counted inascending order from 0 to N{circumflex over ( )}{subframe, μ}_{slot}−1within the subframe, and counted in ascending order from 0 toN{circumflex over ( )}{frame, μ}_{slot}−1 within the frame. N{circumflexover ( )}{slot}_{symb} continuous OFDM symbols are in the slot, based onthe slot configuration and the cyclic prefix. N{circumflex over( )}{slot}_{symb} is 14. The start of the slot n{circumflex over( )}{μ}_{s} within the subframe is temporally aligned with the start ofthe n{circumflex over ( )}{μ}_{s}N{circumflex over ( )}{slot}_{symb}thOFDM symbol within the same subframe.

The subframe, the slot, and a mini-slot will now be described. FIG. 4 isa diagram illustrating the relationship of a subframe, slots, andmini-slots in the time domain. As illustrated in FIG. 4, three types oftime units are defined. The subframe is 1 ms regardless of thesubcarrier spacing. The number of OFDM symbols included in the slot is 7or 14, and the slot length depends on the subcarrier spacing. Here, in acase that the subcarrier spacing is 15 kHz, 14 OFDM symbols are includedin one subframe. The downlink slot may be referred to as PDSCH mappingtype A. The uplink slot may be referred to as PUSCH mapping type A.

The mini-slot (which may be referred to as a subslot) is a time unitincluding OFDM symbols that are less in number than the OFDM symbolsincluded in the slot. FIG. 4 illustrates, by way of example, a case inwhich the mini-slot includes 2 OFDM symbols. The OFDM symbols in themini-slot may match the timing for the OFDM symbols constituting theslot. Note that the smallest unit of scheduling may be a slot or amini-slot. Additionally, allocation of mini-slots may be referred to asnon-slot based scheduling. Mini-slots being scheduled may also beexpressed as resources being scheduled for which the relative timepositions of the start positions of the reference signal and the dataare fixed. The downlink mini-slot may be referred to as PDSCH mappingtype B. The uplink mini-slot may be referred to as PUSCH mapping type B.

FIG. 5 is a diagram illustrating an example of a slot format. In thisregard, a case in which the slot length is 1 ms at a subcarrier spacingof 15 kHz is illustrated as an example. In FIG. 5, D represents thedownlink, and U represents the uplink. As illustrated in FIG. 5, duringa certain time period (for example, the minimum time period to beallocated to one UE in the system), at least one or multiple of thefollowing types of symbols may be included:

-   -   downlink symbols,    -   flexible symbols, and    -   uplink symbols. Note that the ratio of these symbols may be        preset as a slot format.        Additionally, the definition may be made based on the number of        downlink OFDM symbols included in the slot, and the start        position and end position of the symbols within the slot.        Additionally, the number of uplink OFDM symbols or DFT-S-OFDM        symbols included in the slot or the start position and end        position of the symbols within the slot may be defined. Note        that the slot being scheduled may be expressed as resources        being scheduled for which the relative time positions of the        reference signal and the slot boundary are fixed.

The terminal apparatus 1 may receive a downlink signal or a downlinkchannel in the downlink symbols or the flexible symbols. The terminalapparatus 1 may transmit an uplink signal or a downlink channel in theuplink symbols or the flexible symbols.

FIG. 5(a) illustrates an example of a certain time period (which may bereferred to as, for example, a minimum unit of time resource that can beallocated to one UE, a time unit, or the like, additionally, a set ofmultiple minimum units of time resources may be referred to as a timeunit) in which all of the slot is used for downlink transmission, and inFIG. 5(b), the slot is used such that in the first time resource, forexample, the uplink is scheduled via the PDCCH and that after a flexiblesymbol including a processing delay of the PDCCH, a time for switchingfrom downlink to uplink, and generation of a transmit signal, an uplinksignal is transmitted. In FIG. 5(c), the slot is used such that in thefirst time resource, the PDCCH and/or the downlink PDSCH is transmittedand that after a gap for a processing delay, a time for switching fromdownlink to uplink, and generation of a transmit signal, the PUSCH orPUCCH is transmitted. Here, for example, the uplink signal may be usedto transmit the HARQ-ACK and/or CSI, namely, the UCI. In FIG. 5(d), theslot is used such that in the first time resource, the PDCCH and/or thePDSCH is transmitted and that after a gap for a processing delay, a timefor switching from downlink to uplink, and generation of a transmitsignal, the uplink PUSCH and/or PUCCH is transmitted. Here, for example,the uplink signal may be used to transmit the uplink data, namely, theUL-SCH. In FIG. 5(e), the entire slot is used for uplink transmission(PUSCH or PUCCH).

The above-described downlink part and uplink part may include multipleOFDM symbols as is the case with LTE.

FIG. 6 is a diagram illustrating an example of beamforming. Multipleantenna elements are connected to one Transceiver unit (TXRU) 50. Thephase is controlled by using a phase shifter 51 for each antenna elementand a transmission is performed from an antenna element 52, thusallowing a beam for a transmit signal to be directed in any direction.Typically, the TXRU may be defined as an antenna port, and only theantenna port may be defined for the terminal apparatus 1. Controllingthe phase shifter 51 allows setting of directivity in any direction.Thus, the base station apparatus 3 can communicate with the terminalapparatus 1 by using a high gain beam.

Hereinafter, the bandwidth part (BWP) will be described. The BWP is alsoreferred to as a carrier BWP. The BWP may be configured for each of thedownlink and the uplink. The BWP is defined as a set of continuousphysical resources selected from continuous subsets of common resourceblocks. The terminal apparatus 1 can be configured with up to four BWPssuch that one downlink carrier BWP (DL BWP) is activated at a certaintime. The terminal apparatus 1 can be configured with up to four BWPssuch that one uplink carrier BWP (UL BWP) is activated at a certaintime. In a case of carrier aggregation, the BWP may be configured ineach serving cell. At this time, one BWP being configured in a certainserving cell may be expressed as no BWP being configured. Two or moreBWPs being configured may also be expressed as the BWP being configured.

MAC Entity Operation

An activated serving cell always includes one active (activated) BWP.BWP switching for a certain serving cell is used to activate an inactive(deactivated) BWP and to deactivate an active (activated) BWP. BWPswitching for a certain serving cell is controlled by the PDCCHindicating downlink allocation or uplink grant. BWP switching for acertain serving cell may be further controlled by a BWP inactivity timeror RRC signaling, or by the MAC entity itself at the initiation of arandom access procedure. In the addition of the SpCell (PCell or PSCell)or the activation of the SCell, one of the BWPs is a first active BWPwithout reception of the PDCCH indicating downlink allocation or uplinkgrant. A first active DL BWP and a first active UL BWP may be designatedin an RRC message sent from the base station apparatus 3 to the terminalapparatus 1. The active BWP for a certain serving cell is designated inthe RRC or PDCCH sent from the base station apparatus 3 to the terminalapparatus 1. Additionally, the first active DL BWP and the first activeUL BWP may be included in the message 4. In an unpaired spectrum (TDDbands or the like), the DL BWP and the UL BWP are paired, and the BWPswitching is common to the UL and DL. In the active BWP for each of theactivated serving cells for which the BWP is configured, the MAC entityof the terminal apparatus 1 applies normal processing. The normalprocessing includes transmitting a UL-SCH, transmitting an RACH,monitoring the PDCCH, transmitting the PUCCH, transmitting the SRS, andreceiving the DL-SCH. In the inactive BWP for each of the activatedserving cells for which the BWP is configured, the MAC entity of theterminal apparatus 1 does not transmit the UL-SCH, does not transmit theRACH, does not monitor the PDCCH, does not transmit the PUCCH, does nottransmit the SRS, and does not receive the DL-SCH. In a case that acertain serving cell is deactivated, the active BWP may be configured tobe absent (e.g., the active BWP is deactivated).

RRC Operation

BWP information elements (IEs) included in the RRC message (broadcastsystem information or information sent in a dedicated RRC message) isused to configure the BWP. The RRC message transmitted from the basestation apparatus 3 is received by the terminal apparatus 1. For eachserving cell, a network (such as the base station apparatus 3)configures, for the terminal apparatus 1, at least an initial BWPincluding at least a downlink BWP and one uplink BWP (such as a casethat the serving cell is configured with the uplink) or two uplink BWPs(such as a case that a supplementary uplink is used). Furthermore, thenetwork may configure an additional uplink BWP or downlink BWP for acertain serving cell. The BWP configuration is divided into uplinkparameters and downlink parameters. Additionally, the BWP configurationis also divided into common parameters and dedicated parameters. Thecommon parameters (such as a BWP uplink common IE and a BWP downlinkcommon IE) are cell specific. The common parameters for the initial BWPof the primary cell are also provided by using system information. Forall the other serving cells, the network provides the common parametersthrough dedicated signals. The BWP is identified by a BWP ID. For theinitial BWP, the BWP ID is 0. For each of the other BWPs, the BWP IDtakes a value ranging from 1 to 4.

In a case that the higher layer parameter initialDownlinkBWP is notconfigured (provided) for the terminal apparatus 1, an initial DL BWP(initial active DL BWP) may be defined by the position and number ofcontinuous PRBs, the subcarrier spacing, and the cyclic prefix for PDCCHreception in a control resource set (CORESET) for a Type0-PDCCH commonsearch space. The position of each of the continuous PRBs corresponds tothe PRBs in the control resource set for the Type0-PDCCH common searchspace, and starts with the PRB with the smallest index and ends with thePRB with the largest index. In a case that the higher layer parameterinitialDownlinkBWP is configured (provided) for the terminal apparatus1, the initial DL BWP may be indicated by the higher layer parameterinitialDownlinkBWP. The higher layer parameter initialDownlinkBWP may beincluded in the SIB 1 (systemInformationBlockType1,ServingCellConfigCommonSIB) or ServingCellConfigCommon. The informationelement ServingCellConfigCommonSIB is used to configure a cell-specificparameter for the serving cell for the terminal apparatus 1 in SIB 1.

In other words, in a case that the higher layer parameterinitialDownlinkBWP is not configured (provided) for the terminalapparatus 1, the size of the initial DL BWP may correspond to the numberof resource blocks in the control resource set (CORESET #0) for theType0-PDCCH common search space. In a case that the higher layerparameter initialDownlinkBWP is configured (provided) for the terminalapparatus 1, the size of the initial DL BWP may be given bylocationAndBandwidth included in the higher layer parameterinitialDownlinkBWP. The higher layer parameter locationAndBandwidth mayindicate the location and bandwidth of the frequency domain of theinitial DL BWP.

As described above, multiple DL BWPs may be configured for the terminalapparatus 1. In the DL BWPs configured for the terminal apparatus 1, adefault DL BWP can be configured by a higher layer parameterdefaultDownlinkBWP-Id. In a case that the higher layer parameterdefaultDownlinkBWP-Id is not provided for the terminal apparatus 1, thedefault DL BWP is the initial DL BWP.

The terminal apparatus 1 may be provided with an initial UL BWP by SIB1(systemInformationBlockType1) or initialUplinkBWP. The informationelement initialUplinkBWP is used to configure the initial UL BWP. For anoperation on the SpCell or the secondary cell, the initial UL BWP(initial active UL BWP) may be configured (provided) for the terminalapparatus 1 by the higher layer parameter initialUplinkBWP. In a casethat a supplementary uplink carrier (supplementary UL carrier) isconfigured for the terminal apparatus 1, the initial UL BWP in thesupplementary uplink carrier may be configured for the terminalapparatus 1 by initialUplinkBWP included in the higher layer parametersupplementaryUplink.

The control resource set (CORESET) in the present embodiment will bedescribed below.

The control resource set (CORESET) includes time and frequency resourcesfor a search for downlink control information. The configurationinformation of the CORESET includes the identifier of the CORESET(ControlResourceSetId, CORESET-ID) and information identifying thefrequency resource for the CORESET. The information elementControlResourceSetId (the identifier of the CORESET) is used to identifythe control resource set in a certain serving cell. The identifier ofthe CORESET is used among the BWPs in a certain serving cell. Theidentifier of CORESET is unique among the BWPs in the serving cell. Thenumber of CORESETs in each BWP is limited to three, including theinitial CORESET. In a certain serving cell, the value of the identifierof each CORESET takes a value ranging from 0 to 11.

The control resource set identified by the identifier 0(ControlResourceSetId0) of the CORESET is referred to as CORESET #0.CORESET #0 may be configured by pdcch-ConfigSIB1 included in the MIB orPDCCH-ConfigCommon included in ServingCellConfigCommon. In other words,the configuration information of CORESET #0 may be pdcch-ConfigSIB1included in the MIB or PDCCH-ConfigCommon included inServingCellConfigCommon. The configuration information of CORESET #0 maybe configured by controlResourceSetZero included in the PDCCH-ConfigSIB1or PDCCH-ConfigCommon. In other words, the information elementcontrolResourceSetZero is used to indicate CORESET #0 (common CORESET)of the initial DL BWP. The CORESET denoted by pdcch-ConfigSIB1 isCORESET #0. The information element pdcch-ConfigSIB1 in the MIB or thededicated configuration is used to configure the initial DL BWP. CORESETconfiguration information pdcch-ConfigSIB1 for CORESET #0 does notinclude information explicitly identifying the identifier of the CORESETand the frequency resource (e.g., the number of continuous resourceblocks) and the time resource (the number of continuous symbols) for theCORESET, but the frequency resource (e.g., the number of continuousresource blocks) and time resource (the number of continuous symbols)for the CORESET for CORESET #0 can be implicitly identified byinformation included in pdcch-ConfigSIB1. The information elementPDCCH-ConfigCommon is used to configure a cell-specific PDCCH parameterprovided by using the SIB. Additionally, PDCCH-ConfigCommon may also beprovided in a case that handover and the PSCell and/or the SCell areadded. The configuration information of CORESET #0 is included in theconfiguration of the initial BWP. That is, the configuration informationof CORESET #0 need not be included in the configuration of the BWP otherthan the initial BWP. controlResourceSetZero corresponds to four bits inpdcch-ConfigSIB1 (e.g., four MSB bits, four most significant bits).CORESET #0 is a control resource set for Type0-PDCCH common searchspace.

The configuration information of the additional common control resource(additional common CORESET) set may be configured bycommonControlResourceSet included in PDCCH-ConfigCommon. Additionally,the configuration information of the additional common CORESET may alsobe used to specify additional common CORESET for system informationand/or a paging procedure. The configuration information of theadditional common CORESET may be used to specify an additional commonCORESET used in a random access procedure. The configuration informationof the additional common CORESET may be included in the configuration ofeach BWP. The identifier of the CORESET indicated incommonControlResourceSet takes a value other than 0.

The common CORESET may be a CORESET used in the random access procedure(e.g., an additional common CORESET). Additionally, in the presentembodiment, the common CORESET may include CORESET #0 and/or the CORESETconfigured by the configuration information of the additional commonCORESET. In other words, the common CORESET may include CORESET #0and/or the additional common CORESET. CORESET #0 may be referred to ascommon CORESET #0. Also in the BWP other than the BWP for which thecommon CORESET is configured, the terminal apparatus 1 may reference(acquire) the configuration information of the common CORESET.

The configuration information of the one or multiple CORESETs may beconfigured by PDCCH-Config. The information element PDCCH-Config is usedto configure UE-specific PDCCH parameters (e.g., CORSET, a search space,etc.) for a certain BWP. PDCCH-Config may be included in theconfiguration of each BWP.

In other words, in the present embodiment, the configuration informationof the common CORESET indicated by the MIB is pdcch-ConfigSIB1, and theconfiguration information of the common CORESET indicated byPDCCH-ConfigCommon is controlResourceSetZero, and the configurationinformation of the common CORESET (additional common CORESET) indicatedby PDCCH-ConfigCommon is commonControlResourceSet. Additionally, theconfiguration information of one or multiple CORESETs (UE specificallyconfigured Control Resource Sets, UE-specific CORESETs) indicated byPDCCH-Config is controlResourceSetToAddModList.

The search space is defined to search for PDCCH candidatessearchSpaceType included in the search space configuration informationindicates whether the search space is a Common Search Space (CSS) or aUE-specific Search Space (USS). The UE-specific search space is derivedat least from the value of the C-RNTI set by the terminal apparatus 1.In other words, the UE-specific search space is derived separately foreach terminal apparatus 1. The common search space is a search spacecommon to the multiple terminal apparatuses 1, and includes a ControlChannel Element (CCE) with a prescribed index. The CCE includes multipleresource elements. The configuration information of the search spaceincludes information regarding a DCI format monitored in the searchspace.

The configuration information of the search space includes theidentifier of the CORESET identified by the configuration information ofthe CORESET. The CORESET identified by the identifier of the CORESETincluded in the configuration information of the search space isassociated with the search space. In other words, the CORESET associatedwith the search space is the CORESET identified by the identifier of theCORESET included in the search space. The DCI format indicated by theconfiguration information of the search space is monitored by theassociated CORESET. Each search space is associated with a singleCORESET. For example, the configuration information of the search spacefor the random access procedure may be configured by ra-SearchSpace. Inother words, the CORESET associated with ra-SearchSpace is used tomonitor the DCI format provided with a CRC scrambled with the RA-RNTI orTC-RNTI is added.

The terminal apparatus 1 monitors the set of candidates for the PDCCH inone or multiple CORESETs allocated in each active serving cellconfigured to monitor the PDCCH. The set of candidates for the PDCCHcorresponds to one or multiple search space sets. Monitoring meansdecoding of candidates for each PDCCH in accordance with one or multipleDCI formats to be monitored. The set of candidates for the PDCCHmonitored by the terminal apparatus 1 is defined by the PDCCH searchspace sets. One search space set is a common search space set or aUE-specific search space set. In the above, the search space set isreferred to as a search space, the common search space set is referredto as a common search space, and the UE-specific search space set isreferred to as a UE-specific search space. The terminal apparatus 1monitors the PDCCH candidates by using one or multiple search space setsdescribed below.

-   -   Type0-PDCCH common search space set (Type0 common search space):        the search space set is configured by a search space SIB1        (searchSpaceSIB1) indicated by pdcch-ConfigSIB1 or        PDCCH-ConfigCommon indicated by the MIB, or searchSpaceZero        included in PDCCH-ConfigCommon, searchSpaceSIB1 and        searchSpaceZero corresponding to higher layer parameters. The        search space is for monitoring of the DCI format with the CRC        scrambled with SI-RNRI in the primary cell.    -   Type0A-PDCCH common search space set (Type0A common search        space): the search space set is configured by a search space        (searchSpaceOtherSystemInformation) corresponding to a higher        layer parameter and indicated by PDCCH-ConfigCommon. The search        space is for monitoring of the DCI format with the CRC scrambled        with SI-RNRI in the primary cell.    -   Type1-PDCCH common search space set (Type1 common search space):        the search space set is configured by a search space for a        random access procedure (ra-SearchSpace) corresponding to a        higher layer parameter and indicated by PDCCH-ConfigCommon. The        search space is for monitoring of the DCI format with the CRC        scrambled with RA-RNRI or TC-RNTI in the primary cell.        Type1-PDCCH common search space set is a search space set for        the random access procedure.    -   Type2-PDCCH common search space set (Type2 common search space):        the search space set is configured by a search space for the        paging procedure (pagingSearchSpace) corresponding to a higher        layer parameter and indicated by PDCCH-ConfigCommon. The search        space is for monitoring of the DCI format with the CRC scrambled        with P-RNTI in the primary cell.    -   Type3-PDCCH common search space set (Type3 common search space):        the search space set is configured by a search space of a common        search space type (SearchSpace) corresponding to a higher layer        parameter and indicated by PDCCH-Config. The search space is for        monitoring of the DCI format with the CRC scrambled with        INT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, TPC-PUCCH-RNTI, or        TPC-SRS-RNTI. For the primary cell, the search space is for        monitoring of the DCI format with the CRC scrambled with C-RNTI,        CS-RNTI(s), or MSC-C-RNTI.    -   UE-specific search space set: the search space set is configured        by a search space of a UE-specific search space type        (SearchSpace) corresponding to a higher layer parameter and        indicated by PDCCH-Config. The search space is for monitoring of        the DCI format with the CRC scrambled with C-RNTI, CS-RNTI(s),        or MSC-C-RNTI.

In a case that the terminal apparatus 1 is provided with one or multiplesearch space sets by the corresponding higher layer parameter(searchSpaceZero, searchSpaceSIB1, searchSpaceOtherSystemInformation,pagingSearchSpace, ra-SearchSpace, etc.) and provided with C-RNTI orCS-RNTI, the terminal apparatus 1 may use the one or multiple searchspace sets to monitor PDCCH candidates for DCI format 0_0 and DCI format1_0 with the C-RNTI or CS-RNTI.

The configuration information of the BWP is divided into theconfiguration information of the DL BWP and the configurationinformation of the UL BWP. The configuration information of the BWPincludes an information element bwp-Id (identifier of the BWP). Theidentifier of the BWP included in the configuration information of theDL BWP is used to identify (reference) the DL BWP in a certain servingcell. The identifier of the BWP included in the configurationinformation of the UL BWP is used to identify (reference) the UL BWP ina certain serving cell. The identifier of the BWP is assigned to each ofthe DL BWP and UL BWP. For example, the identifier of the BWPcorresponding to the DL BWP may be referred to as a DL BWP index. Theidentifier of the BWP corresponding to the UL BWP may be referred to asa UL BWP index. The initial DL BWP is referenced by identifier 0 of theDL BWP. The initial UL BWP is referenced by identifier 0 of the UL BWP.Each of the other DL BWPs or the other UL BWPs may be referenced by anyof the identifiers of the BWPs ranging from 1 to maxNrofBWPs. In otherwords, the identifier of the BWP set to 0 (bwp-Id=0) is associated withthe initial BWP and prevented from being used for the other BWPs.maxNrofBWPs is the maximum number of BWPs per serving cell and is 4. Inother words, each of the identifiers of the other BWPs takes a valueranging from 1 to 4. Other higher layer configuration information isassociated with a particular BWP by utilizing the identifier of the BWP.The DL BWP and UL BWP having the same BWP identifier may mean that theDL BWP and UL BWP are paired.

For the terminal apparatus 1, one primary cell and up to 15 secondarycells may be configured.

A procedure for receiving the PDSCH will be described below.

By detecting a PDCCH including DCI format 1_0 or DCI format 1_1, theterminal apparatus 1 may decode (receive) the corresponding PDSCH. Thecorresponding PDSCH is scheduled (indicated) by the DCI format (DCI).The start position (starting symbol) of the scheduled PDSCH is referredto as S. The starting symbol S of the PDSCH may be the first symbol inwhich the PDSCH is transmitted (mapped) within a certain slot. Thestarting symbol S corresponds to the beginning of the slot. For example,in a case that S has a value of 0, the terminal apparatus 1 may receivethe PDSCH from the first symbol in the certain slot. Additionally, forexample, in a case that S has a value of 2, the terminal apparatus 1 mayreceive the PDSCH from the third symbol of the certain slot. The numberof continuous symbols of the scheduled PDSCH is referred to as L. Thenumber of continuous symbols L is counted from the starting symbol S.The determination of S and L allocated to the PDSCH will be describedlater.

The type of PDSCH mapping includes PDSCH mapping type A and PDSCHmapping type B. For the PDSCH mapping type A, S takes a value rangingfrom 0 to 3. L takes a value ranging from 3 to 14. However, the sum of Sand L takes a value ranging from 3 to 14. For the PDSCH mapping type B,S takes a value ranging from 0 to 12. L takes one of the values {2, 4,and 7}. However, the sum of S and L takes a value ranging from 2 to 14.

The position of a DMRS symbol for the PDSCH depends on the type of thePDSCH mapping. The position of the first DMRS symbol (first DM-RSsymbol) for the PDSCH depends on the type of the PDSCH mapping. For thePDSCH mapping type A, the position of the first DMRS symbol may beindicated in a higher layer parameter dmrs-TypeA-Position. In otherwords, the higher layer parameter dmrs-TypeA-Position is used toindicate the position of the first DMRS for the PDSCH or PUSCH.dmrs-TypeA-Position may be set to either ‘pos2’ or ‘pos3’. For example,in a case that dmrs-TypeA-Position is set to ‘pos2’, the position of thefirst DMRS symbol for the PDSCH may correspond to the third symbol inthe slot. For example, in a case that dmrs-TypeA-Position is set to‘pos3’, the position of the first DMRS symbol for the PDSCH maycorrespond to the fourth symbol in the slot. In this regard, S can takea value of 3 only in a case that dmrs-TypeA-Position is set to ‘pos3’.In other words, in a case that dmrs-TypeA-Position is set to ‘pos2’,then S takes a value ranging from 0 to 2. For the PDSCH mapping type B,the position of the first DMRS symbol corresponds to the first symbol ofthe allocated PDSCH.

FIG. 7 is a diagram illustrating an example of the PDSCH mapping typeaccording to the present embodiment. FIG. 7(A) is a diagram illustratingan example of PDSCH mapping type A. In FIG. 7(A), S of the allocatedPDSCH is 3. L of the allocated PDSCH is 7. In FIG. 7(A), the position ofthe first DMRS symbol for the PDSCH corresponds to the fourth symbol inthe slot. In other words, dmrs-TypeA-Position is set to ‘pos3’. FIG.7(B) is a diagram illustrating an example of PDSCH mapping type A. InFIG. 7(B), S of the allocated PDSCH is 4. L of the allocated PDSCH is 4.In FIG. 7(B), the position of the first DMRS symbol for the PDSCHcorresponds to the first symbol to which the PDSCH is allocated.

A method for identifying PDSCH time domain resource allocation will bedescribed below.

The base station apparatus 3 may use the DCI to perform scheduling suchthat the terminal apparatus 1 receives the PDSCH. The terminal apparatus1 may receive the PDSCH by detecting the DCI addressed to the terminalapparatus 1. In identifying PDSCH time domain resource allocation, theterminal apparatus 1 first determines a resource allocation table to beapplied to the corresponding PDSCH. The resource allocation tableincludes one or multiple PDSCH time domain resource allocationconfigurations. Next, the terminal apparatus 1 may select one PDSCH timedomain resource allocation configuration in the determined resourceallocation table, based on a value indicated in a ‘Time domain resourceassignment’ field included in the DCI scheduling the correspondingPDSCH. In other words, the base station apparatus 3 determines the PDSCHresource allocation for the terminal apparatus 1, generates a value forthe ‘Time domain resource assignment’ field, and transmits, to theterminal apparatus 1, the DCI including the ‘Time domain resourceassignment’ field. The terminal apparatus 1 identifies the resourceallocation in the time direction for the PDSCH, based on the value setin the ‘Time domain resource assignment’ field.

FIG. 10 is a diagram defining which resource allocation table is appliedto the PDSCH time domain resource allocation. With reference to FIG. 10,the terminal apparatus 1 may determine a resource allocation table to beapplied to the PDSCH time domain resource allocation. The resourceallocation table includes one or multiple PDSCH time domain resourceallocation configurations. In the present embodiment, each resourceallocation table is classified as one of (I) a predefined resourceallocation table and (II) a resource allocation table configured from ahigher layer RRC signal. The predefined resource allocation table isdefined as a default PDSCH time domain resource allocation A, a defaultPDSCH time domain resource allocation B, and a default PDSCH time domainresource allocation C. Hereinafter, the default PDSCH time domainresource allocation A is referred to as a default table A. The defaultPDSCH time domain resource allocation B is referred to as a defaulttable B. The default PDSCH time domain resource allocation C is referredto as a default table C.

FIG. 11 is a diagram illustrating an example of the default table Aaccording to the present embodiment. FIG. 12 is a diagram illustratingan example of the default table B according to the present embodiment.FIG. 13 is a diagram illustrating an example of the default table Caccording to the present embodiment. With reference to FIG. 11, thedefault table A includes 16 rows. Each row in the default table Aindicates a PDSCH time domain resource allocation configuration.Specifically, in FIG. 11, indexed rows each define the PDSCH mappingtype, a slot offset K₀ between the PDCCH including the DCI and thecorresponding PDSCH, the starting symbol S for the PDSCH in the slot,and the number L of continuous allocated symbols. The resourceallocation table configured from the higher layer RRC signal is given bya higher layer signal pdsch-TimeDomainAllocationList. An informationelement PDSCH-TimeDomainResourceAllocation indicates a PDSCH time domainresource allocation configuration. PDSCH-TimeDomainResourceAllocationmay also be used to configure a time domain relationship between thePDCCH including the DCI and the PDSCH. pdsch-TimeDomainAllocationListincludes one or multiple information elementsPDSCH-TimeDomainResourceAllocation. In other words,pdsch-TimeDomainAllocationList is a list including one or multipleelements (information elements). One information elementPDSCH-TimeDomainResourceAllocation may also be referred to as one entry(or one row). pdsch-TimeDomainAllocationList may include up to 16entries. Each entry may be defined by K₀, mappingType, andstartSymbolAndLength. K₀ indicates the slot offset between the PDCCHincluding the DCI and the corresponding PDSCH. In a case that thePDSCH-TimeDomainResourceAllocation does not indicate K₀, the terminalapparatus 1 may assume that the value of K₀ is 0. mappingType indicateseither PDSCH mapping type A or PDSCH mapping type A.startSymbolAndLength is an index providing an effective combination ofthe starting symbol S of the PDSCH and the number L of continuousallocated symbols. startSymbolAndLength may be referred to as a startand length indicator SLIV. In other words, unlike in the default tabledirectly defining the starting symbol S and the continuous symbols L,the starting symbol S and the continuous symbols L are given based onthe SLIV. The base station apparatus 3 can set the SLIV value such thatthe PDSCH time domain resource allocation does not exceed the slotboundary. The slot offset K₀ and the SLIV will be described below.

The higher layer signal pdsch-TimeDomainAllocationList may be includedin pdsch-ConfigCommon and/or pdsch-Config. The information elementpdsch-ConfigCommon is used to configure a cell-specific parameter forthe PDSCH for a certain BWP. The information element pdsch-Config isused to configure a UE-specific parameter for the PDSCH for a certainBWP.

FIG. 14 is a diagram illustrating an example of calculating the SLIV.

In FIG. 14, 14 is the number of symbols included in the slot. FIG. 14illustrates an example of calculating the SLIV for a Normal CyclicPrefix (NCP). The value of the SLIV is calculated based on the number ofsymbols included in the slot, the starting symbol S, and the number L ofcontinuous symbols. Here, the value of L is equal to or greater than 1and does not exceed (14−S). In a case of an ECP, in a case that the SLIVis calculated, 6 and 12 are used instead of 7 and 14 in FIG. 14.

The slot offset K₀ will be described below.

As described above, at the subcarrier spacing configuration μ, the slotsare counted in ascending order from 0 to N{circumflex over( )}{subframe, μ}_{slot}−1 within the subframe, and counted in ascendingorder from 0 to N{circumflex over ( )}{frame, μ}_{slot}−1 within theframe. K₀ is the number of slots based on the subcarrier spacing of thePDSCH. K₀ may take a value ranging from 0 to 32. In a certain subframeor frame, the number of the slots is counted in ascending order from 0.Slot number n with a subcarrier spacing configuration of 15 kHzcorresponds to slot numbers 2n and 2n+1 with a subcarrier spacingconfiguration of 30 kHz.

The terminal apparatus 1 detects DCI scheduling the PDSCH. The slotassigned to the PDSCH is given by (Expression 1) Floor(n*2μ^(PDSCH)/2μ^(PDCCH))+K₀. The function Floor (A) outputs a maximuminteger that does not exceed A. n is a slot in which a PDCCH thatschedules the PDSCH is detected. μ_(PDSCH) is a subcarrier spacingconfiguration for the PDSCH. μ_(PDCCH) is a subcarrier spacingconfiguration for the PDCCH.

With reference to FIG. 10, the terminal apparatus 1 may determine whichresource allocation table is to be applied to the PDSCH time domainresource allocation. In other words, the terminal apparatus 1 maydetermine the resource allocation table to be applied to the PDSCHscheduled by the DCI, at least based on some or all of the followingelements (A) to (F).

Element A: the type of the RNTI that scrambles the CRC to be added tothe DCI

Element B: the type of the search space in which the DCI is detected

Element C: whether the CORESET associated with the search space isCORESET #0

Element D: whether pdsch-ConfigCommon includespdsch-TimeDomainAllocationList

Element E: whether pdsch-Config includes pdsch-TimeDomainAllocationList

Element F: SS/PBCH and CORESET multiplexing pattern

For the element A, the type of the RNTI that scrambles the CRC added tothe DCI is one of the Si-RNTI, the RA-RNTI, the TC-RNTI, the P-RNTI, theC-RNTI, the MCS-C-RNTI, or the CS-RNTI.

For the element B, the type of the search space in which the DCI isdetected is the common search space or the UE-specific search space. Thecommon search space includes a Type0 common search space, a Type1 commonsearch space, and a Type2 common search space.

In Example A, the terminal apparatus 1 may detect the DCI in any commonsearch space associated with CORESET #0. The detected DCI is providedwith the CRC scrambled with one of the C-RNTI, the MCS-C-RNTI, and theCS-RNTI. The terminal apparatus 1 may determine a resource allocationtable to be applied to the PDSCH scheduled by the DCI. In a case thatpdsch-ConfigCommon includes pdsch-TimeDomainAllocationList for theterminal apparatus 1, the terminal apparatus 1 may determine a resourceallocation table configured from the higher layer RRC signal. Theresource allocation table is given by pdsch-TimeDomainAllocationListincluded in pdsch-ConfigCommon. In a case that pdsch-ConfigCommon doesnot include pdsch-TimeDomainAllocationList for the terminal apparatus 1,the terminal apparatus 1 may determine the default table A. In otherwords, the terminal apparatus 1 may use and apply, to the determinationof the PDSCH time domain resource allocation, the default table Aindicating the PDSCH time domain resource allocation configuration.

In addition, in Example B, the terminal apparatus 1 may detect the DCIin any common search space not associated with CORESET #0. The detectedDCI is provided with the CRC scrambled with one of the C-RNTI, theMCS-C-RNTI, and the CS-RNTI. The terminal apparatus 1 may determine aresource allocation table to be applied to the PDSCH scheduled by theDCI. In a case that pdsch-Config includes pdsch-TimeDomainAllocationListfor the terminal apparatus 1, the terminal apparatus 1 may determine aresource allocation table given from pdsch-TimeDomainAllocationListprovided by pdsch-Config to be a resource allocation table to be appliedto the PDSCH time domain resource allocation. In other words, in a casethat pdsch-Config includes pdsch-TimeDomainAllocationList, the terminalapparatus 1 may use and apply pdsch-TimeDomainAllocationList provided byusing pdsch-Config, to the determination of the PDSCH time domainresource allocation regardless of whether pdsch-ConfigCommon includespdsch-TimeDomainAllocationList. Additionally, in a case thatpdsch-Config does not include pdsch-TimeDomainAllocationList andpdsch-ConfigCommon includes pdsch-TimeDomainAllocationList, the terminalapparatus 1 may determine a resource allocation table given frompdsch-TimeDomainAllocationList provided by pdsch-ConfigCommon to be aresource allocation table to be applied to the PDSCH time domainresource allocation. In other words, the terminal apparatus 1 uses andapplies, to the determination of the PDSCH time domain resourceallocation, pdsch-TimeDomainAllocationList provided by usingpdsch-ConfigCommon. Additionally, in a case that pdsch-Config does notinclude pdsch-TimeDomainAllocationList and pdsch-ConfigCommon does notinclude pdsch-TimeDomainAllocationList, the terminal apparatus 1 maydetermine the default table A to be a resource allocation table to beapplied to the PDSCH time domain resource allocation.

In addition, in Example C, the terminal apparatus 1 may detect the DCIin the UE-specific search space. The detected DCI is provided with theCRC scrambled with one of the C-RNTI, the MCS-C-RNTI, and the CS-RNTI.The terminal apparatus 1 may determine the resource allocation table tobe applied to the PDSCH scheduled by the DCI. In a case thatpdsch-Config includes pdsch-TimeDomainAllocationList for the terminalapparatus 1, the terminal apparatus 1 may determine the resourceallocation table to be applied to the PDSCH time domain resourceallocation to be a resource allocation table given frompdsch-TimeDomainAllocationList provided by using pdsch-Config. In otherwords, in a case that pdsch-Config includespdsch-TimeDomainAllocationList, the terminal apparatus 1 may use andapply pdsch-TimeDomainAllocationList provided by using pdsch-Config, tothe determination of the PDSCH time domain resource allocationregardless of whether pdsch-ConfigCommon includespdsch-TimeDomainAllocationList. Additionally, in a case thatpdsch-Config does not include pdsch-TimeDomainAllocationList andpdsch-ConfigCommon includes pdsch-TimeDomainAllocationList, the terminalapparatus 1 may determine a resource allocation table given frompdsch-TimeDomainAllocationList provided by pdsch-ConfigCommon to be aresource allocation table to be applied to the PDSCH time domainresource allocation. In other words, the terminal apparatus 1 uses andapplies, to the determination of the PDSCH time domain resourceallocation, pdsch-TimeDomainAllocationList provided by usingpdsch-ConfigCommon. Additionally, in a case that pdsch-Config does notinclude pdsch-TimeDomainAllocationList and pdsch-ConfigCommon does notinclude pdsch-TimeDomainAllocationList, the terminal apparatus 1 maydetermine the default table A to be a resource allocation table to beapplied to the PDSCH time domain resource allocation.

A comparison between Example B and Example C indicates that the methodfor determining the resource allocation table to be applied to the PDSCHdetected in the UE-specific search space is similar to a method fordetermining a resource allocation table to be applied to a PDSCHdetected in any common search space not associated with CORESET #0.

Next, the terminal apparatus 1 may select one PDSCH time domain resourceallocation configuration in the determined resource allocation table,based on the value indicated in the ‘Time domain resource assignment’field included in the DCI scheduling the corresponding PDSCH. Forexample, in a case that the resource allocation table applied to thePDSCH time domain resource allocation is the default table A, a value mindicated in the ‘Time domain resource assignment’ field may indicate arow index m+1 in the default table A. At this time, the PDSCH timedomain resource allocation is a time domain resource allocationconfiguration indicated by the row index m+1. The terminal apparatus 1assumes the time domain resource allocation configuration indicated bythe row index m+1, and receives the PDSCH. For example, in a case thatthe value m indicated in the ‘Time domain resource assignment’ field is0, the terminal apparatus 1 uses a PDSCH time domain resource allocationconfiguration with the row index 1 in the default table A to identifythe resource allocation in the time direction for the PDSCH scheduled bythe corresponding DCI.

In a case that the resource allocation table applied to the PDSCH timedomain resource allocation is a resource allocation table given frompdsch-TimeDomainAllocationList, the value m indicated in the ‘Timedomain resource assignment’ field corresponds to the (m+1)th element(entry, row) in the list pdsch-TimeDomainAllocationList. For example, ina case that the value m indicated in the ‘Time domain resourceassignment’ field is 0, the terminal apparatus 1 may reference the firstelement (entry) in the list pdsch-TimeDomainAllocationList. For example,in a case that the value m indicated in the ‘Time domain resourceassignment’ field is 1, the terminal apparatus 1 may reference thesecond element (entry) in the list pdsch-TimeDomainAllocationList.

Hereinafter, the number of bits (size) of the ‘Time domain resourceassignment’ field included in the DCI will be described.

By detecting the PDCCH including DCI format 1_0 or DCI format 1_1, theterminal apparatus 1 may decode (receive) the corresponding PDSCH. Thenumber of bits in the ‘Time domain resource assignment’ field in the DCIformat 1_0 may be a fixed number of bits. For example, the fixed numberof bits may be four. In other words, the size of the ‘Time domainresource assignment’ field in DCI format 1_0 is four bits. The size ofthe ‘Time domain resource assignment’ field included in DCI format 1_1may be a variable number of bits. For example, the number of bits in the‘Time domain resource assignment’ field included in DCI format 1_1 maybe one of 0, 1, 2, 3, and 4.

The determination of the number of bits in the ‘Time domain resourceassignment’ field included in DCI format 1_1 will be described below.

The number of bits in the ‘Time domain resource assignment’ fieldincluded in DCI format 1_1 may be given at least based on (I) whetherpdsch-ConfigCommon includes pdsch-TimeDomainAllocationList, and/or (II)whether pdsch-Config includes pdsch-TimeDomainAllocationList and/or(III) the number of rows included in the predefined default table. Inthe present embodiment, DCI format 1_1 is provided with a CRC scrambledwith one of the C-RNTI, the MCS-C-RNTI, and the CS-RNTI. DCI format 1_1may be detected in the UE-specific search space. In the presentembodiment, the meaning of ‘pdsch-Config includespdsch-TimeDomainAllocationList’ may be the meaning of‘pdsch-TimeDomainAllocationList is provided by using pdsch-Config’. Themeaning of ‘pdsch-ConfigCommon includes pdsch-TimeDomainAllocationList’may mean ‘pdsch-TimeDomainAllocationList is provided by usingpdsch-ConfigCommon’.

The number of bits in the ‘Time domain resource assignment’ field may begiven as ceiling (log₂(I)). A function Ceiling (A) outputs a minimuminteger not less than A. In a case that pdsch-TimeDomainAllocationListis configured (provided) for the terminal apparatus 1, the value of Imay be the number of entries included in pdsch-TimeDomainAllocationList.In a case that pdsch-TimeDomainAllocationList is not configured(provided) for the terminal apparatus 1, the value of I may be thenumber of rows in the default table (default table A). In other words,in a case that pdsch-TimeDomainAllocationList is configured for theterminal apparatus 1, the number of bits in the Time domain resourceassignment’ field may be given based on the number of entries includedin pdsch-TimeDomainAllocationList. In a case thatpdsch-TimeDomainAllocationList is not configured for the terminalapparatus 1, the number of bits in the Time domain resource assignment’field may be given based on the number of rows in the default table(default table A). Specifically, in a case that pdsch-Config includespdsch-TimeDomainAllocationList, the value of I may be the number ofentries included in pdsch-TimeDomainAllocationList provided by usingpdsch-Config. Additionally, in a case that pdsch-Config does not includepdsch-TimeDomainAllocationList and pdsch-ConfigCommon includespdsch-TimeDomainAllocationList, the value of I may be the number ofentries included in pdsch-TimeDomainAllocationList provided by usingpdsch-ConfigCommon. Additionally, in a case that pdsch-Config does notinclude pdsch-TimeDomainAllocationList and pdsch-ConfigCommon does notinclude pdsch-TimeDomainAllocationList, the value of I may be the numberof rows included in the default table (e.g., the default table A).

In other words, in a case that pdsch-TimeDomainAllocationList isconfigured (provided) for the terminal apparatus 1, the number of bitsin the ‘Time domain resource assignment’ field may be given as ceiling(log₂(I)). In a case that pdsch-TimeDomainAllocationList is notconfigured (provided) for the terminal apparatus 1, the number of bitsin the ‘Time domain resource assignment’ field may be a fixed number ofbits. For example, the fixed number of bits may be four bits.

Here, I may be the number of entries included inpdsch-TimeDomainAllocationList. Specifically, in a case thatpdsch-Config includes pdsch-TimeDomainAllocationList, the value of I maybe the number of entries included in pdsch-TimeDomainAllocationListprovided by using pdsch-Config. Additionally, in a case thatpdsch-Config does not include pdsch-TimeDomainAllocationList andpdsch-ConfigCommon includes pdsch-TimeDomainAllocationList, the value ofI may be the number of entries included inpdsch-TimeDomainAllocationList provided by using pdsch-ConfigCommon.

In this way, the terminal apparatus 1 can identify the number of bits inthe ‘Time domain resource assignment’ field generated by the basestation apparatus 3. In other words, the terminal apparatus 1 cancorrectly receive the PDSCH addressed to the terminal apparatus 1scheduled by the base station apparatus 3.

A procedure for receiving the PUSCH will be described below.

In response to detection of DCI format 0_0 or the PDCCH including DCIformat 0_1, the terminal apparatus 1 may transmit the correspondingPUSCH. In other words, the corresponding PUSCH may be scheduled(indicated) by the DCI format (DCI). Additionally, the PUSCH may also bescheduled by RAR UL grant included in an RAR message. The start position(starting symbol) of the scheduled PUSCH is referred to as S. Thestarting symbol S of the PUSCH may be the first symbol to which thePUSCH is transmitted (mapped) within a certain slot. The starting symbolS corresponds to the beginning of the slot. For example, in a case thatS has a value of 0, the terminal apparatus 1 may transmit the PUSCH fromthe first symbol in the certain slot. Additionally, for example, in acase that S has a value of 2, the terminal apparatus 1 may transmit thePUSCH from the third symbol of the certain slot. The number ofcontinuous symbols of the scheduled PUSCH is referred to as L. Thenumber of continuous symbols L is counted from the starting symbol S.Determination of S and L allocated to the PUSCH will be described later.

The type of PUSCH mapping includes PUSCH mapping type A and PUSCHmapping type B. For PUSCH mapping type A, S has a value of 0. L takes avalue ranging from 4 to 14. However, the sum of S and L takes a valueranging from 4 to 14. For the PUSCH mapping type B, S takes a valueranging from 0 to 13. L takes a value ranging from 1 to 14. However, thesum of S and L takes a value ranging from 1 to 14.

The position of the DMRS symbol for the PUSCH depends on the type of thePUSCH mapping. The position of the first DMRS symbol (first DM-RSsymbol) for the PUSCH depends on the type of the PUSCH mapping. For thePUSCH mapping type A, the position of the first DMRS symbol may beindicated in the higher layer parameter dmrs-TypeA-Position.dmrs-TypeA-Position is set to one of ‘pos2’ or ‘pos3’. For example, in acase that dmrs-TypeA-Position is set to ‘pos2’, the position of thefirst DMRS symbol for the PUSCH may correspond to the third symbol inthe slot. For example, in a case that dmrs-TypeA-Position is set to‘pos3’, the position of the first DMRS symbol for the PUSCH maycorrespond to the fourth symbol in the slot. For the PUSCH mapping typeB, the position of the first DMRS symbol may correspond to the firstsymbol of the allocated PUSCH.

A method of identifying the PUSCH time domain resource allocation willbe described below.

The base station apparatus 3 may perform scheduling by using the DCI tocause the terminal apparatus 1 to transmit the PUSCH. Then, by detectingthe DCI addressed to the terminal apparatus 1, the terminal apparatus 1may transmit the PUSCH. In a case of identifying the PUSCH time domainresource allocation, the terminal apparatus 1 first determines aresource allocation table to be applied to the corresponding PUSCH. Theresource allocation table includes one or multiple PUSCH time domainresource allocation configurations. Then, the terminal apparatus 1 mayselect one PUSCH time domain resource allocation configuration in thedetermined resource allocation table, based on the value indicated inthe ‘Time domain resource assignment’ field included in the DCIscheduling the corresponding PUSCH. In other words, the base stationapparatus 3 determines the PUSCH resource allocation for the terminalapparatus 1, generates a value for the ‘Time domain resource assignment’field, and transmits, to the terminal apparatus 1, the DCI including the‘Time domain resource assignment’ field. The terminal apparatus 1identifies the resource allocation in the time direction for the PUSCH,based on the value set in the ‘Time domain resource assignment’ field.

FIG. 16 is a diagram defining which resource allocation table is appliedto the PUSCH time domain resource allocation. With reference to FIG. 16,the terminal apparatus 1 may determine a resource allocation table to beapplied to the PUSCH time domain resource allocation. The resourceallocation table includes one or multiple PUSCH time domain resourceallocation configurations. In the present embodiment, the resourceallocation table is classified as one of (I) a predefined resourceallocation table and (II) a resource allocation table configured from ahigher layer RRC signal. The predefined resource allocation table isdefined as a default PUSCH time domain resource allocation A.Hereinafter, the default PUSCH time domain resource allocation A isreferred to as the PUSCH default table A.

FIG. 17 is a diagram illustrating an example of the PUSCH default tableA for the Normal Cyclic Prefix (NCP). With reference to FIG. 17, thePUSCH default table A includes 16 rows. Each row in the PUSCH defaulttable A indicates a PUSCH time domain resource allocation configuration.Specifically, in FIG. 17, indexed rows each define the PUSCH mappingtype, a slot offset K₂ between the PDCCH including the DCI and thecorresponding PUSCH, the starting symbol S for the PUSCH in the slot,and the number L of continuous allocated symbols. The resourceallocation table configured from the higher layer RRC signal is given bya higher layer signal pusch-TimeDomainAllocationList. An informationelement PUSCH-TimeDomainResourceAllocation indicates a PUSCH time domainresource allocation configuration. PUSCH-TimeDomainResourceAllocationmay be used to configure a time domain relationship between the PDCCHincluding the DCI and the PUSCH. pusch-TimeDomainAllocationList includesone or multiple information elements PUSCH-TimeDomainResourceAllocation.In other words, pusch-TimeDomainAllocationList is a list including oneor multiple elements (information elements). One information elementPDSCH-TimeDomainResourceAllocation may also be referred to as one entry(or one row). pusch-TimeDomainAllocationList may include up to 16entries. Each entry may be defined by K₂, mappingType, andstartSymbolAndLength. K₂ indicates a slot offset between the PDCCHincluding the DCI and the PUSCH scheduled by the DCI. In a case thatPUSCH-TimeDomainResourceAllocation does not indicate K₂, the terminalapparatus 1 may assume that K₂ has a value of 1 in a case that the PUSCHhas a subcarrier spacing of 15 kHz or 30 kHz, and that K₂ has a value of2 in a case that the PUSCH has a subcarrier spacing of 60 kHz, and thatK₂ has a value of 3 in a case that the PUSCH has a subcarrier spacing of120 kHz. mappingType indicates one of PUSCH mapping type A or PUSCHmapping type A. startSymbolAndLength is an index providing an effectivecombination of the starting symbol S of the PUSCH and the number L ofcontinuous allocated symbols. startSymbolAndLength may be referred to asa start and length indicator SLIV. In other words, unlike in the defaulttable directly defining the starting symbol S and the continuous symbolsL, the starting symbol S and the continuous symbols L are given based onthe SLIV. The base station apparatus 3 can set the SLIV value such thatthe time domain resource allocation of the PUSCH does not exceed theslot boundary. The value of SLIV is calculated based on the number ofsymbols included in the slot, the starting symbol S, and the number L ofcontinuous symbols, as in the equations in FIG. 14.

The higher layer signal pusch-TimeDomainAllocationList may be includedin pusch-ConfigCommon and/or pusch-Config. The information elementpusch-ConfigCommon is used to configure a cell-specific parameter forthe PUSCH for a certain BWP. The information element pusch-Config isused to configure a UE-specific parameter for the PUSCH for the certainBWP.

The terminal apparatus 1 detects the DCI scheduling the PUSCH. The slotin which the PUSCH is transmitted is given by (Expression 4) Floor(n*2μ^(PUSCH)/2μ^(PDCCH))+K₂. n is a slot in which a PDCCH is detectedthat schedules the PUSCH. μ_(PUSCH) is a subcarrier spacingconfiguration for the PUSCH. μ_(PDCCH) is a subcarrier spacingconfiguration for the PDCCH.

In FIG. 17, K₂ has a value of one of j, j+1, j+2, and j+3. The value ofj is a value specified for the subcarrier spacing of the PUSCH. Forexample, in a case that the subcarrier spacing to which the PUSCH isapplied is 15 kHz or 30 kHz, the value of j may be one slot. Forexample, in a case that the subcarrier spacing to which the PUSCH isapplied is 60 kHz, the value of j may be two slots. For example, in acase that the subcarrier spacing to which the PUSCH is applied is 120kHz, the value of j may be three slots.

As described above, the terminal apparatus 1 may determine, withreference to FIG. 16, which resource allocation table is applied to thePUSCH time domain resource allocation.

In Example D, the terminal apparatus 1 may determine a resourceallocation table to be applied to the PUSCH scheduled by RAR UL grant.In a case that pusch-ConfigCommon includespusch-TimeDomainAllocationList for the terminal apparatus 1, theterminal apparatus 1 may determine a resource allocation tableconfigured from the higher layer RRC signal. The resource allocationtable is given by pusch-TimeDomainAllocationList included inpusch-ConfigCommon. Additionally, in a case that pusch-ConfigCommon doesnot include pusch-TimeDomainAllocationList for the terminal apparatus 1,the terminal apparatus 1 may determine the PUSCH default table A. Inother words, the terminal apparatus 1 may use and apply, to thedetermination of the PUSCH time domain resource allocation, the defaulttable A indicating the PUSCH time domain resource allocationconfiguration.

In addition, in Example E, the terminal apparatus 1 may detect the DCIin any common search space associated with CORESET #0. The detected DCIis provided with the CRC scrambled with one of the C-RNTI, theMCS-C-RNTI, the TC-RNTI, and the CS-RNTI. Then, the terminal apparatus 1may determine a resource allocation table to be applied to the PUSCHscheduled by the DCI. In a case that pusch-ConfigCommon includespusch-TimeDomainAllocationList for the terminal apparatus 1, theterminal apparatus 1 may determine a resource allocation table givenfrom pusch-TimeDomainAllocationList provided by pusch-ConfigCommon to bea resource allocation table to be applied to the PUSCH time domainresource allocation. Additionally, in a case that pusch-ConfigCommondoes not include pusch-TimeDomainAllocationList, the terminal apparatus1 may determine the PUSCH default table A to be a resource allocationtable to be applied to the PUSCH time domain resource allocation.

In addition, in Example F, the terminal apparatus 1 may detect the DCIin (I) any common search space associated with CORESET #0 or (II) theUE-specific search space. The detected DCI is provided with the CRCscrambled with one of the C-RNTI, the MCS-C-RNTI, the TC-RNTI, and theCS-RNTI. The terminal apparatus 1 may determine a resource allocationtable to be applied to the PUSCH scheduled by the DCI. In a case thatthe pusch-Config includes pusch-TimeDomainAllocationList for theterminal apparatus 1, the terminal apparatus 1 may determine a resourceallocation table given from pusch-TimeDomainAllocationList provided bypusch-Config to be a resource allocation table to be applied to thePUSCH time domain resource allocation. In other words, in a case thatpusch-Config includes pusch-TimeDomainAllocationList, the terminalapparatus 1 may use and apply, to the determination of the PUSCH timedomain resource allocation, pusch-TimeDomainAllocationList provided byusing pusch-Config, regardless of whether pusch-ConfigCommon includespusch-TimeDomainAllocationList. Additionally, in a case thatpusch-Config does not include pusch-TimeDomainAllocationList andpusch-ConfigCommon includes pusch-TimeDomainAllocationList, the terminalapparatus 1 may determine a resource allocation table given frompusch-TimeDomainAllocationList provided by pusch-ConfigCommon to be aresource allocation table to be applied to the PUSCH time domainresource allocation. In other words, the terminal apparatus 1 uses andapplies pusch-TimeDomainAllocationList provided by usingpusch-ConfigCommon to the determination of the PUSCH time domainresource allocation. Additionally, in a case that pusch-Config does notinclude pusch-TimeDomainAllocationList and pusch-ConfigCommon does notinclude pusch-TimeDomainAllocationList, the terminal apparatus 1 maydetermine the PUSCH default table A to be a resource allocation table tobe applied to the PUSCH time domain resource allocation.

Subsequently, the terminal apparatus 1 may select one PUSCH time domainresource allocation configuration in the determined resource allocationtable, based on the value indicated in the ‘Time domain resourceassignment’ field included in the DCI scheduling the PUSCH. For example,in a case that the resource allocation table applied to the PUSCH timedomain resource allocation is the PUSCH default table A, the value mindicated in the ‘Time domain resource assignment’ field may indicatethe row index m+1 of the default table A. At this time, the PUSCH timedomain resource allocation is a time domain resource allocationconfiguration indicated by the row index m+1. The terminal apparatus 1assumes the time domain resource allocation configuration indicated bythe row index m+1, and transmits the PUSCH. For example, in a case thatthe value m indicated in the ‘Time domain resource assignment’ field is0, the terminal apparatus 1 uses a PUSCH time domain resource allocationconfiguration with the row index 1 in the PUSCH default table A toidentify the resource allocation in the time direction for the PUSCHscheduled by the corresponding DCI.

In a case that the resource allocation table applied to the PUSCH timedomain resource allocation is a resource allocation table given frompusch-TimeDomainAllocationList, the value m indicated in the ‘Timedomain resource assignment’ field corresponds to the (m+1)th element(entry, row) in the list pusch-TimeDomainAllocationList. For example, ina case that the value m indicated in the ‘Time domain resourceassignment’ field is 0, the terminal apparatus 1 may reference the firstelement (entry) in the list pusch-TimeDomainAllocationList. For example,in a case that the value m indicated in the ‘Time domain resourceassignment’ field is 1, the terminal apparatus 1 may reference thesecond element (entry) in the list pusch-TimeDomainAllocationList.

Hereinafter, the number of bits (size) of the ‘Time domain resourceassignment’ field included in the DCI will be described.

In response to detection of the PDCCH including DCI format 0_0 or DCIformat 0_1, the terminal apparatus 1 may transmit the correspondingPUSCH. The number of bits in the ‘Time domain resource assignment’ fieldin the DCI format 0_0 may be a fixed number of bits. For example, thefixed number of bits may be four. In other words, the size of the ‘Timedomain resource assignment’ field in DCI format 0_0 is four bits. Thesize of the ‘Time domain resource assignment’ field included in DCIformat 0_1 may be a variable number of bits. For example, the number ofbits in the ‘Time domain resource assignment’ field included in DCIformat 0_1 may be one of 0, 1, 2, 3, and 4.

The determination of the number of bits in the ‘Time domain resourceassignment’ field included in DCI format 0_1 will be described below.

The number of bits in the ‘Time domain resource assignment’ field may begiven as ceiling (log₂(I)). In a case thatpusch-TimeDomainAllocationList is configured (provided) for the terminalapparatus 1, the value of I may be the number of entries included in thepusch-TimeDomainAllocationList. In a case thatpusch-TimeDomainAllocationList is not configured (provided) for theterminal apparatus 1, the value of I may be the number of rows in thePUSCH default table A. In other words, in a case thatpusch-TimeDomainAllocationList is configured for the terminal apparatus1, the number of bits in the Time domain resource assignment’ field maybe given based on the number of entries included inpusch-TimeDomainAllocationList. In a case thatpusch-TimeDomainAllocationList is not configured for the terminalapparatus 1, the number of bits in the Time domain resource assignment’field may be given based on the number of rows in the default table(default table A). Specifically, in a case that the pusch-Configincludes pusch-TimeDomainAllocationList, the value of I may be thenumber of entries included in pusch-TimeDomainAllocationList provided byusing pusch-Config. Additionally, in a case that pusch-Config does notinclude pusch-TimeDomainAllocationList and pusch-ConfigCommon includespusch-TimeDomainAllocationList, the value of I may be the number ofentries included in pusch-TimeDomainAllocationList provided by usingpusch-ConfigCommon. In a case that the pusch-Config does not includepusch-TimeDomainAllocationList and pusch-ConfigCommon does not includepusch-TimeDomainAllocationList, the value of I may be the number of rowsincluded in the PUSCH default table A.

Hereinafter, slot aggregation transmission (multi-slot transmission)according to the present embodiment will be described.

A higher layer parameter pusch-AggregationFactor is used to indicate thenumber of repetition transmissions of data (a transport block). Thehigher layer parameter pusch-AggregationFactor indicates a value of oneof 2, 4, and 8. The base station apparatus 3 may transmit, to theterminal apparatus 1, the higher layer parameter pusch-AggregationFactorindicating the number of data transmission repetitions. The base stationapparatus 3 can cause, using pusch-AggregationFactor, the terminalapparatus 1 to repeat transmission of the transport block a prescribednumber of times. The terminal apparatus 1 may receive the higher layerparameter pusch-AggregationFactor from the base station apparatus 3 andmay repeat transmission of the transport block by using the number ofrepetition transmissions indicated in pusch-AggregationFactor thusreceived. However, in a case of not receiving pusch-AggregationFactorfrom the base station apparatus, the terminal apparatus 1 may considerthe number of repetition transmissions of the transport block as one. Inother words, in this case, the terminal apparatus 1 may perform onetransmission of the transport block scheduled by the PDCCH. In otherwords, in a case that the terminal apparatus 1 does not receivepusch-AggregationFactor from the base station apparatus, the terminalapparatus 1 need not perform slot aggregation transmission (multi-slottransmission) on the transport block scheduled by the PDCCH.

Specifically, the terminal apparatus 1 may receive the PDCCH includingthe DCI format provided with the CRC scrambled with the C-RNTI or theMCS-C-RNTI, and transmit the PUSCH scheduled by the PDCCH. In a casethat pusch-AggregationFactor is configured for the terminal apparatus 1,the terminal apparatus 1 may transmit the PUSCH N times in N continuousslots starting with the slot in which the PUSCH is first transmitted. Asingle PUSCH transmission (transmission of a transport block) may beperformed per slot. In other words, transmission of the same transportblock (repetition transmission) is performed only once within one slot.The value of N is indicated by pusch-AggregationFactor. In a case thatpusch-AggregationFactor is not configured for the terminal apparatus 1,N may have a value of one. The slot in which the PUSCH is firsttransmitted may be given by (Expression 4) as described above. The PUSCHtime domain resource allocation given based on the PDCCH scheduling thePUSCH may be applied to continuous N slots. That is, the same symbolallocation (the same starting symbol S and the same number L ofcontinuous allocated symbols) may be applied to continuous N slots. Theterminal apparatus 1 may repeatedly transmit the transport block overcontinuous N slots starting with the slot in which the PUSCH is firsttransmitted. The terminal apparatus 1 may repeatedly transmit thetransport block by using the same symbol allocation in each slot. Theslot aggregation transmission performed by the terminal apparatus 1 in acase that the higher layer parameter pusch-AggregationFactor isconfigured may be referred to as a first aggregation transmission. Inother words, the higher layer parameter pusch-AggregationFactor is usedto indicate the number of repetition transmissions of the firstaggregation transmission (repetition transmissions). The higher layerparameter pusch-AggregationFactor is also referred to as a firstaggregation transmission parameter.

In the first aggregation transmission, the 0th transmission occasion maybe in the slot in which the PUSCH is first transmitted. The 1sttransmission occasion may be in the slot next to the slot in which thePUSCH is first transmitted. The (N−1)th transmission occasion may be inthe Nth slot from the slot in which the PUSCH is first transmitted. Aredundancy version applied to transmission of a transport block may bedetermined based on the (n−1)th transmission occasion of the transportblock and rv_(id) indicated by the DCI scheduling the PUSCH. A sequenceof the redundancy versions is {0, 2, 3, 1}. The variable rv_(id) is anindex to the sequence of the redundancy versions. The variable isupdated by the variable modulo 4. The redundancy version is used forcoding (rate matching) of the transport block transmitted on the PUSCH.The redundancy version may be incremented in the order of 0, 2, 3,and 1. The repetition transmission of the transport block may beperformed in order of the redundancy version.

FIG. 15 is a diagram illustrating an example of the redundancy versionapplied to a transmission occasion.

As illustrated in FIG. 15, the redundancy version rv_(id) applied to the0th transmission occasion is a value indicated by the DCI scheduling thePUSCH (transport block). For example, in a case that the DCI schedulingthe PUSCH indicates that rv_(id) has a value of 0, the terminalapparatus 1 may determine the redundancy version rv_(id) to be providedto the transmission occasion, with reference to the first row in FIG.15. The redundancy version to be applied to the transmission occasionmay be incremented in the order of 0, 2, 3, and 1. For example, in acase that the DCI scheduling the PUSCH indicates that rv_(id) has avalue of 2, the terminal apparatus 1 may determine the redundancyversion rv_(id) to be provided to the transmission occasion, withreference to the second row in FIG. 15. The redundancy version appliedto the transmission occasion may be incremented in the order of 2, 3, 1,and 0.

In a case that at least one symbol in the symbol allocation for acertain transmission occasion is indicated as a downlink symbol througha higher layer parameter, the terminal apparatus 1 need not transmit thetransport block in a certain slot in the transmission occasion.

In the present embodiment, the base station apparatus 3 may transmit ahigher layer parameter pusch-AggregationFactor-r16 to the terminalapparatus 1. The higher layer parameter pusch-AggregationFactor-r16 maybe used to indicate the number of repetition transmissions of data(transport block). The higher layer parameterpusch-AggregationFactor-r16 may be used to indicate the number ofrepetition transmissions of slot aggregation transmission and/ormini-slot aggregation transmission. The slot aggregation transmissionand the mini-slot aggregation transmission will be described below.

In the present embodiment, pusch-AggregationFactor-r16 is configuredwith a value of one of n1, n2, and n3, for example. The values of n1,n2, and n3 may respectively be 2, 4, and 8, or may be other values. n1,n2, and n3 each indicate the number of repetition transmissions of thetransport block. In other words, pusch-AggregationFactor-r16 mayindicate one value of the number of repetition transmissions. The numberof repetition transmissions of the transport block may be the number ofrepetition transmissions within the slot (such as N_(rep)), or thenumber of repetition transmissions both within the slot and across slots(such as N_(total)), or the number of repetition transmissions acrossslots (such as N_(total)). Alternatively, the base station apparatus 3may transmit, to the terminal apparatus 1, pusch-AggregationFactor-r16including more than one element such that the number of repetitiontransmissions can be more flexibly configured for the terminal apparatus1. Each element (information element or entry) may be used to indicatethe number of repetition transmissions of the transport block. In otherwords, pusch-AggregationFactor-r16 may indicate the value of the numberof multiple repetition transmissions being more than one. In the presentembodiment, a second aggregation transmission may refer to the slotaggregation transmission performed by the terminal apparatus 1 in a casethat the higher layer parameter pusch-AggregationFactor-r16 isconfigured. In other words, the higher layer parameterpusch-AggregationFactor-r16 may be used to indicate at least the numberof repetition transmissions of the second aggregation transmission. Thehigher layer parameter pusch-AggregationFactor-r16 is also referred toas a second aggregation transmission parameter. The base stationapparatus 3 may indicate any of the elements through the field includedin the DCI scheduling the transport block, and notify the terminalapparatus 1 of the number of repetition transmissions of the transportblock. A specific procedure will be described below. Additionally, thebase station apparatus 3 may indicate any of the elements via a MACControl Element (MAC CE), and notify the terminal apparatus 1 of thenumber of repetition transmissions of the transport block. In otherwords, the base station apparatus 3 may indicate any of the elements viaa field included in the DCI and/or the MAC CE, and dynamically notifythe terminal apparatus 1 of the number of repetition transmissions. Theapplication, to the terminal apparatus 1, of the function of the numberof dynamic repetitions may mean that the terminal apparatus 1 isdynamically notified of the number of repetition transmissions by thebase station apparatus 3.

As a first example, the base station apparatus 3 need not transmitpusch-AggregationFactor and pusch-AggregationFactor-r16 to the terminalapparatus 1. In other words, the terminal apparatus 1 need not beconfigured with pusch-AggregationFactor and pusch-AggregationFactor-r16.In other words, the terminal apparatus 1 may receive, from the basestation apparatus 3, an RRC message not including (not configured with)pusch-AggregationFactor and pusch-AggregationFactor-r16. In this case,the terminal apparatus 1 may transmit the PUSCH in the slot given by(Expression 4) as described above. In other words, the number ofrepetition transmissions of the transport block may be one. In otherwords, the terminal apparatus 1 need not perform slot aggregationtransmission and/or mini-slot aggregation transmission.

As a second example, the base station apparatus 3 may transmitpusch-AggregationFactor and need not transmitpusch-AggregationFactor-r16, to the terminal apparatus 1. In otherwords, for the terminal apparatus 1, pusch-AggregationFactor may beconfigured, whereas pusch-AggregationFactor-r16 need not be configured.In other words, the terminal apparatus 1 may receive, from the basestation apparatus 3, an RRC message including (configured with)pusch-AggregationFactor and not including (not configured with)pusch-AggregationFactor-r16. In this case, the terminal apparatus 1 maytransmit the PUSCH N times in continuous N slots starting with the slotgiven by (Expression 4) as described above. In other words, the numberof repetition transmissions of the transport block may be N indicated bypusch-AggregationFactor. The terminal apparatus 1 may perform the firstaggregation transmission on the PUSCH scheduled by the DCI. The PDCCHincluding the DCI scheduling the PUSCH may be transmitted in the CSS ormay be transmitted in the USS. The same symbol allocation may be appliedto continuous N slots.

As a third example, the base station apparatus 3 need not transmitpusch-AggregationFactor but may transmit pusch-AggregationFactor-r16, tothe terminal apparatus 1. In other words, for the terminal apparatus 1,pusch-AggregationFactor need not be configured, whereaspusch-AggregationFactor-r16 may be configured. In other words, theterminal apparatus 1 may receive, from the base station apparatus 3, anRRC message not including (not configured with) pusch-AggregationFactorbut including (configured with) pusch-AggregationFactor-r16. In thiscase, the terminal apparatus 1 may transmit the PUSCH M times in one ormultiple slots from the slot given by (Expression 4) as described above.Unlike in the first aggregation transmission, multiple slots may becontinuous or discontinuous. In other words, the number M of repetitionsof the transport block may be indicated by pusch-AggregationFactor-r16.The PDCCH including the DCI scheduling the PUSCH may be transmitted inthe CSS or may be transmitted in the USS. The same symbol allocationneed not be applied to multiple slots. In other words, the PUSCH timedomain resource allocation (symbol allocation) applied to the firstrepetition transmission of the transport block may be given based on theDCI scheduling the transport block. However, the PUSCH symbol allocationapplied to the second and subsequent repetition transmissions of thetransport block may be different from the symbol allocation given basedon the PDCCH (such as DCI) that schedules the PUSCH. This is referred toas symbol allocation expansion. Specifically, the starting symbol Sapplied to the second and subsequent repetition transmissions of thetransport block may be different from the starting symbol S given basedon the PDCCH (starting symbol expansion). For example, the startingsymbol S applied to the second and subsequent repetition transmissionsof the transport block may be the 0th symbol at the beginning of theslot. The starting symbol S applied to the second and subsequentrepetition transmissions of the transport block may be the same as thestarting symbol S given based on the PDCCH. For example, the startingsymbol S applied to the second and subsequent repetition transmissionsof the transport block may be the first available symbol at thebeginning of the slot. Additionally, the number L of continuousallocated symbols of the PUSCH to be applied to the second andsubsequent repetition transmissions of the transport block may bedifferent from the number L of continuous allocated symbols given basedon the PDCCH (symbol number expansion). The number L of continuousallocated symbols of the PUSCH to be applied to the second andsubsequent repetition transmissions of the transport block may be thesame as the number L of continuous allocated symbols given based on thePDCCH. The starting symbol and/or the number of symbols in eachrepetition transmission may be determined based on the availablesymbols. The number L of symbols of the Xth PUSCH may be determinedbased on one, multiple, or all of the starting symbol S given based onthe PDCCH, the number L of symbols given based on the PDCCH, the numberof symbols in the slot, the available symbols within the slot,N_(total), N_(rep), and N_(slots).

Additionally, in a third example, in a case thatpusch-AggregationFactor-r16 includes one and/or more than one element,the terminal apparatus 1 may select one of the multiple elements byusing the ‘Repetition Number’ field included in the DCI (dynamicrepetition number). The ‘Repetition Number’ field included in the DCImay be present in a case that pusch-AggregationFactor-r16 includes oneand/or more than one element, and may otherwise be absent. The‘Repetition Number’ field included in the DCI may be absent in a casethat pusch-AggregationFactor-r16 is not configured. The value indicatedby the selected element is the number of repetition transmissions of thetransport block scheduled by the DCI. The terminal apparatus 1 mayrepeatedly transmit the transport block the notified number of times.The number of bits in the ‘Repetition Number’ field may be given asceiling (log₂(X+1)) or ceiling (log₂(X)). X is the number of elementsincluded in pusch-AggregationFactor-r16. In a case that the number ofbits in the ‘Repetition Number’ field is given as ceiling (log₂(X)), thevalue m indicated in the ‘Repetition Number’ field may correspond to the(m+1)th element included in pusch-AggregationFactor-r16. The number ofrepetition transmissions of the transport block may be a value indicatedby the (m+1)th element. For example, in a case that the value mindicated in the ‘Repetition Number’ field is 0, the terminal apparatus1 may reference the first element included inpusch-AggregationFactor-r16. The value indicated by the element may begreater than 1. The value indicated by the element may be equal to 1.Additionally, in a case that the number of bits in the ‘RepetitionNumber’ field is given as ceiling (log₂(X+1)), the value m indicated inthe ‘Repetition Number’ field may correspond to the mth element includedin pusch-AggregationFactor-r16. In this case, m has a non-zero value. Ina case that the value m indicated in the ‘Repetition Number’ field is 0,the terminal apparatus 1 may consider the number of repetitiontransmissions as one. The value indicated by each element may be greaterthan one. In a case that pusch-AggregationFactor-r16 is configured,functions for symbol allocation expansion (starting symbol expansionand/or symbol number expansion), the number of dynamic repetitionsand/or mini-slot aggregation transmission are applied to the aggregationtransmission (the second aggregation transmission).

Additionally, as a fourth example, the base station apparatus 3 maytransmit pusch-AggregationFactor and pusch-AggregationFactor-r16 to theterminal apparatus 1. In other words, the terminal apparatus 1 may beconfigured with pusch-AggregationFactor and pusch-AggregationFactor-r16.In other words, the terminal apparatus 1 may receive, from the basestation apparatus 3, an RRC message including (configuring)pusch-AggregationFactor and pusch-AggregationFactor-r16. Basically, thefunction for symbol allocation expansion (starting symbol expansionand/or symbol number expansion), the number of dynamic repetitions,and/or mini-slot aggregation transmission is applied, the functioncorresponding to an operation performed in a case thatpusch-AggregationFactor-r16 is configured as described as the thirdexample.

In the following, the terminal apparatus 1 configured withpusch-AggregationFactor-r16 may determine whether or not the ‘RepetitionNumber’ field is present in certain DCI, based on at least some or allof elements (A) to (D) described below.

Element A: the type of the RNTI that scrambles the CRC to be added tothe DCI

Element B: the type of the search space in which the DCI is detected

Element C: the type of the DCI format

Element D: information indicated in the field of DCI

For the element A, in a case that the type of the RNTI that scramblesthe CRC to be added to the DCI is one of the SI-RNTI, RA-RNTI, TC-RNTI,P-RNTI, C-RNTI, MCS-C-RNTI, and CS-RNTI, the ‘Repetition Number’ fieldmay be absent from the DCI. In a case that the type of the RNTI thatscrambles the CRC to be added to the DCI is NEW-RNTI, the ‘RepetitionNumber’ field included in the DCI may be present.

For the element B, the type of the search space in which the terminalapparatus 1 monitors the DCI is a common search space or a UE-specificsearch space. The common search space includes a Type0 common searchspace, a Type1 common search space, and a Type2 common search space. Ina case that the search space in which the DCI is monitored is a commonsearch space, the ‘Repetition Number’ field may be absent from the DCI.In a case that the search space in which the DCI is monitored is aUE-specific search space, a ‘Repetition Number’ field may be present inthe DCI.

For the element C, the type of the DCI format includes DCI format 0_0,DCI format 0_1, and DCI format 0_2. In a case that the DCI is of DCIformat 0_0 and DCI format 0_1, the ‘Repetition Number’ field may beabsent from the DCI. In a case that the DCI is of DCI format 0_2, a‘Repetition Number’ field may be present in the DCI. Alternatively, in acase that the DCI is of DCI format 0_0, the ‘Repetition Number’ fieldmay be absent from the DCI. In a case that the DCI is of DCI format 0_1or DCI format 0_2, the ‘Repetition Number’ field may be present in theDCI.

Additionally, for example, in a case that DCI format 0_0 is monitored inthe common search space, the ‘Repetition Number’ field may be absentfrom the DCI. In a case that DCI format 0_0 is monitored in theUE-specific search space, the ‘Repetition Number’ field may be presentin the DCI. Additionally, for example, in a case that DCI format 0_1 isscrambled with the NEW-RNTI, the ‘Repetition Number’ field may bepresent in the DCI. In a case that DCI format 0_1 is scrambled with anRNTI other than the NEW-RNTI, the ‘Repetition Number’ field may beabsent from the DCI.

In the following, the terminal apparatus 1 configured withpusch-AggregationFactor-r16 may determine, based on at least some or allof the following elements (A) to (C), whether to apply theabove-described function provided in a case thatpusch-AggregationFactor-r16 is configured for the PUSCH transmissionscheduled by the DCI.

Element A: the type of the RNTI that scrambles the CRC to be added tothe DCI Element B: the type of the search space in which the DCI isdetected Element C: the type of the DCI format For the element A, thetype of the RNTI that scrambles the CRC to be added to the DCI is one ofthe SI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, C-RNTI, MCS-C-RNTI, and CS-RNTI,the function provided in a case that pusch-AggregationFactor-r16 isconfigured for the PUSCH transmission scheduled by the DCI need not beapplied. Additionally, in a case that the type of the RNTI thatscrambles the CRC to be added to the DCI is the NEW-RNTI, the functionprovided in a case that pusch-AggregationFactor-r16 is configured forthe PUSCH transmission scheduled by the DCI may be applied.

For the element B, the type of the search space in which the terminalapparatus 1 monitors the DCI is a common search space or a UE-specificsearch space. The common search space includes a Type0 common searchspace, a Type1 common search space, and a Type2 common search space. Ina case that the search space in which the DCI is monitored is the commonsearch space, the function provided in a case thatpusch-AggregationFactor-r16 is configured for the PUSCH transmissionscheduled by the DCI need not be applied. In a case that the searchspace in which the DCI is monitored is the UE-specific search space, thefunction provided in a case that pusch-AggregationFactor-r16 isconfigured for the PUSCH transmission scheduled by the DCI may beapplied.

For the element C, the type of the DCI format includes DCI format 0_0,DCI format 0_1, and DCI format 0_2. In a case that the DCI is of DCIformat 0_0 and DCI format 0_1, the function provided in a case thatpusch-AggregationFactor-r16 is configured for the PUSCH transmissionscheduled by the DCI need not be applied. In a case that the DCI is ofDCI format 0_2, the function provided in a case thatpusch-AggregationFactor-r16 is configured for the PUSCH transmissionscheduled by the DCI may be applied. Alternatively, in a case that theDCI is of DCI format 0_0, the function provided in a case thatpusch-AggregationFactor-r16 is configured for the PUSCH transmissionscheduled by the DCI need not be applied. In a case that the DCI is ofDCI format 0_1 or DCI format 0_2, the function provided in a case thatpusch-AggregationFactor-r16 is configured for the PUSCH transmissionscheduled by the DCI may be applied.

Additionally, for example, in a case that DCI format 0_0 is monitored inthe common search space, the function provided in a case thatpusch-AggregationFactor-r16 is configured for the PUSCH transmissionscheduled by the DCI need not be applied. In a case that DCI format 0_0is monitored in the UE-specific search space, the function provided in acase that pusch-AggregationFactor-r16 is configured for the PUSCHtransmission scheduled by the DCI may be applied.

In a case that the function provided in a case that thepusch-AggregationFactor-r16 is configured is not applied, as describedabove, the first aggregation transmission may be performed for the PUSCHtransmission scheduled by the DCI in a case that pusch-AggregationFactoris configured. In other words, the terminal apparatus 1 may repeatedlytransmit the transport block N times across N continuous slots. Thevalue of N may be given by pusch-AggregationFactor. The same symbolallocation may be applied in the N slots. Additionally, in a case thatthe function provided in a case that the pusch-AggregationFactor-r16 isconfigured is not applied, the PUSCH transmission scheduled by the DCImay be performed once in a case that pusch-AggregationFactor is notconfigured. In other words, the terminal apparatus 1 may transmit thetransport block once.

The mini-slot aggregation transmission (subslot aggregationtransmission, multi-subslot transmission, intra-slot aggregationtransmission) in the present embodiment will be described below.

As described above, for the slot aggregation transmission (the slotaggregation transmission in the first aggregation transmission and thesecond aggregation transmission), one uplink grant may schedule two ormore PUSCH repetition transmissions. Repetition transmissions areperformed in the respective continuous slots (or respective availableslots). In other words, in the slot aggregation, the maximum number ofrepetition transmissions of the same transport block within one slot(one available slot) is one. The available slot may be a slot in whichthe repetition transmission of the transport block is actuallyperformed.

In the mini-slot aggregation transmission, one uplink grant may scheduletwo or more PUSCH repetition transmissions. The repetition transmissionsmay be performed in the same slot or across continuous available slots.In the scheduled PUSCH repetition transmissions, each slot may have adifferent number of repetition transmissions performed in the slot,based on the symbols available for PUSCH repetition transmission in theslot (available slot). In other words, in the mini-slot aggregationtransmission, the number of repetition transmissions of the sametransport block within one slot (one available slot) may be one or more.In other words, in the mini-slot aggregation transmission, the terminalapparatus 1 can transmit one or more repetition transmissions of thesame transport block to the base station apparatus 3 within one slot. Inother words, it can also be said that the mini-slot aggregationtransmission means a mode that supports intra-slot aggregation. Thesymbol allocation expansion (starting symbol expansion and/or symbolnumber expansion) and/or the number of dynamic repetitions describedabove may be applied to the mini-slot aggregation transmission.

In the present embodiment, the terminal apparatus 1 may determine, basedat least on (I) a higher layer parameter and/or (II) a field included inthe uplink grant, whether the aggregation transmission is applied to thePUSCH transmission for which the uplink grant is scheduled, or whetherany of the aggregation transmission types is applied. The aggregationtransmission type may include the first aggregation transmission and thesecond aggregation transmission. As another example, the secondaggregation transmission may be divided into different types: slotaggregation transmission and mini-slot aggregation transmission. Inother words, the types of aggregation transmission may include firstslot aggregation transmission (first aggregation transmission), secondslot aggregation transmission (slot aggregation in the secondaggregation transmission), and the mini-slot aggregation transmission.

In Aspect A of the present embodiment, the base station apparatus 3 maynotify, by the higher layer parameter, the terminal apparatus 1 of whichof the slot aggregation transmission and the mini-slot aggregationtransmission is configured. Which of the slot aggregation transmissionand the mini-slot aggregation transmission is configured may mean whichof the slot aggregation transmission and the mini-slot aggregationtransmission is applied. For example, pusch-AggregationFactor may beused to indicate the number of repetition transmissions of the firstaggregation transmission (the first slot aggregation transmission).pusch-AggregationFactor-r16 may be used to indicate the number ofrepetition transmissions of the second slot aggregation transmissionand/or the mini-slot aggregation transmission.pusch-AggregationFactor-r16 may be a common parameter for the secondslot aggregation transmission and/or the mini-slot aggregationtransmission. A higher layer parameter repTxWithinSlot-r16 may be usedto indicate mini-slot aggregation transmission. In a case that thehigher layer parameter repTxWithinSlot-r16 is effectively set, theterminal apparatus 1 may consider that the mini-slot aggregationtransmission is applied to transport block transmission, and may performthe mini-slot aggregation transmission. In other words, in a case thatpusch-AggregationFactor-r16 is configured for the terminal apparatus 1and repTxWithinSlot-r16 is configured (set effectively), the terminalapparatus 1 may consider that mini-slot aggregation transmission isapplied. The number of repetition transmissions of the mini-slotaggregation transmission may be indicated bypusch-AggregationFactor-r16. In a case that pusch-AggregationFactor-r16is configured for the terminal apparatus 1 and repTxWithinSlot-r16 isnot configured, the terminal apparatus 1 may consider that the secondslot aggregation transmission is applied. The number of repetitiontransmissions of the second slot aggregation transmission may beindicated by pusch-AggregationFactor-r16. Additionally, in a case thatpusch-AggregationFactor is configured for the terminal apparatus 1 andpusch-AggregationFactor-r16 is not configured, the terminal apparatus 1may consider that the first slot aggregation transmission is applied. Ina case that pusch-AggregationFactor and pusch-AggregationFactor-r16 arenot configured for the terminal apparatus 1, the terminal apparatus 1may consider that the aggregation transmission is not applied and mayperform one transmission of the PUSCH for which the uplink grant isscheduled. In the present embodiment, configuring the higher layerparameter (e.g., repTxWithinSlot-r16) may mean that the higher layerparameter (e.g., repTxWithinSlot-r16) is validly set or that the higherlayer parameter (e.g., repTxWithinSlot-r16) is transmitted from the basestation apparatus 3. In the present embodiment, not configuring thehigher layer parameter (e.g., repTxWithinSlot-r16) may mean that thehigher layer parameter (e.g., repTxWithinSlot-r16) is invalidlyconfigured or that the higher layer parameter (e.g.,repTxWithinSlot-r16) is not transmitted from the base station apparatus3.

In Aspect B of the present embodiment, the base station apparatus 3 maynotify, by the higher layer parameter, the terminal apparatus 1 of whichof the slot aggregation transmission and the mini-slot aggregationtransmission is configured. pusch-AggregationFactor may be used toindicate the number of repetition transmissions of the first slotaggregation transmission. pusch-AggregationFactor-r16 may be used toindicate the number of repetition transmissions of the second slotaggregation transmission and/or the mini-slot aggregation transmission.pusch-AggregationFactor-r16 may be a common parameter for the secondslot aggregation transmission and/or the mini-slot aggregationtransmission. In a case that pusch-AggregationFactor-r16 is configuredfor the terminal apparatus 1, the second slot aggregation transmissionand/or the mini-slot aggregation transmission may be applied to theterminal apparatus 1.

Next, the terminal apparatus 1 may determine which of the slotaggregation transmission and the mini-slot aggregation transmission isapplied, based on the field included in the uplink grant schedulingPUSCH transmission (PUSCH repetition transmission). As an example, acertain field included in the uplink grant may be used to indicate whichof the slot aggregation transmission and the mini-slot aggregationtransmission is applied. The field may include one bit. Additionally,the terminal apparatus 1 may determine which of the slot aggregationtransmission and the mini-slot aggregation transmission is applied,based on the field included in the uplink grant transmitted from thebase station apparatus 3. The terminal apparatus 1 may determine thatthe slot aggregation transmission is applied in a case that the fieldindicates 0, and may determine that the mini-slot aggregationtransmission is applied in a case that the field indicates 1.

As an example, the terminal apparatus 1 may determine which of the slotaggregation transmission and the mini-slot aggregation transmission isapplied, based on the ‘Time domain resource assignment’ field includedin the uplink grant transmitted from the base station apparatus 3. Asdescribed above, the ‘Time domain resource assignment’ field is used toindicate the PUSCH time domain resource allocation. The terminalapparatus 1 may determine which of the slot aggregation transmission andthe mini-slot aggregation transmission is applied, based on whether thenumber L of continuous allocated symbols obtained based on the ‘Timedomain resource assignment’ field exceeds a prescribed value. Theterminal apparatus 1 may determine that the slot aggregationtransmission is applied, in a case that the symbol number L exceeds aprescribed value. The terminal apparatus 1 may determine that themini-slot aggregation transmission is applied, in a case that the symbolnumber L does not exceed the prescribed value. The prescribed value maybe a value indicated by the higher layer parameter. The prescribed valuemay be a value defined in advance in specifications or the like. Forexample, the prescribed value may be seven symbols.

In Aspect C of the present embodiment, the base station apparatus 3 maynotify, by the higher layer parameter, the terminal apparatus 1 of whichof the slot aggregation transmission and the mini-slot aggregationtransmission is configured. For example, the base station apparatus 3may individually configure the higher layer parameter indicating thenumber of repetition transmissions for each of the second slotaggregation transmission and the mini-slot aggregation transmission. Forexample, pusch-AggregationFactor-r16 may be used to indicate the numberof repetition transmissions of the second slot aggregation transmission.pusch-MiniAggregationFactor-r16 may be used to indicate the number ofrepetition transmissions of the mini-slot aggregation transmission. In acase of configuring one of the second slot aggregation transmission andthe mini-slot aggregation transmission for the terminal apparatus 1, thebase station apparatus 3 may transmit the corresponding higher layerparameter. In other words, in a case that the base station apparatus 3transmits pusch-AggregationFactor-r16 to the terminal apparatus 1, theterminal apparatus 1 may consider that the first slot aggregationtransmission is applied. In a case that the base station apparatus 3transmits pusch-MiniAggregationFactor-r16 to the terminal apparatus 1,the terminal apparatus 1 may consider that the mini-slot aggregationtransmission is applied.

In Aspect A, Aspect B, or Aspect C of the present embodiment, theterminal apparatus 1 may determine which of the slot aggregationtransmission and the mini-slot aggregation transmission is applied,based on the PUSCH mapping type obtained based on the ‘Time domainresource assignment’ field included in the uplink grant. Specifically,in a case that the second slot aggregation transmission and/or themini-slot aggregation transmission is applied, the terminal apparatus 1may consider that the second slot aggregation transmission and/or themini-slot aggregation transmission is not applied in a case that PUSCHmapping type A is obtained as a PUSCH mapping type based on the ‘Timedomain resource assignment’ field. In a case thatpusch-AggregationFactor is transmitted from the base station apparatus3, the terminal apparatus 1 may determine that the first slotaggregation transmission is applied to the PUSCH transmission scheduledby the uplink grant. The number of repetition transmissions of the slotaggregation transmission is indicated by pusch-AggregationFactor. In acase that pusch-AggregationFactor is not transmitted from the basestation apparatus 3, the terminal apparatus 1 may perform onetransmission of the PUSCH scheduled by the uplink grant. In other words,in a case of satisfying a first condition, the terminal apparatus 1 andthe base station apparatus 3 may apply the same symbol allocation inmultiple slots and repeatedly transmit the transport block N times incontinuous N slots in a case that pusch-AggregationFactor is configured,and transmit the transport block once in a case thatpusch-AggregationFactor is not configured. In a case of satisfying asecond condition, the terminal apparatus 1 and the base stationapparatus 3 may transmit the transport block by applying the secondaggregation transmission as described above. In this case, the firstcondition at least includes the PUSCH mapping type being indicated asthe type A in the DCI scheduling the PUSCH transmission. The secondcondition at least includes the PUSCH mapping type being indicated asthe type B in the DCI scheduling the PUSCH transmission. The value of Nis given by pusch-AggregationFactor. That is, the type B may be themapping type of the PUSCH to which the second slot aggregationtransmission and/or mini-slot aggregation transmission is applied.Either the type A or the type B may be the mapping type of the PUSCH towhich the first slot aggregation transmission is applied.

The determination of the number of repetition transmissions and aprocedure for frequency hopping according to the present embodiment willbe described below.

The terminal apparatus 1 may determine N_(total). N_(total) is the totalnumber (total number of PUSCHs repeatedly transmitted) of repetitiontransmissions of the same transport block scheduled by one uplink grant.In other words, N_(total) is the number of one or multiple PUSCHsscheduled by one uplink grant. The terminal apparatus 1 may determineN_(rep). N_(rep) is the number of repetition transmissions of the sametransport block within the slot (number of PUSCHs repeatedlytransmitted). In other words, N_(rep) is, for one or multiple PUSCHsscheduled by one uplink grant, the number of one or multiple PUSCHsallocated in a certain slot. The terminal apparatus 1 may determineN_(slots). N_(slots) is the number of slots in which the same transportblock scheduled by one uplink grant is repeatedly transmitted. In otherwords, N_(slots) is the number of slots used for one or multiple PUSCHsscheduled by one uplink grant. The terminal apparatus 1 may deriveN_(total) from N_(rep) and N_(slots). The terminal apparatus 1 mayderive N_(rep) from N_(total) and N_(slots). The terminal apparatus 1may derive N_(slots) from N_(rep) and N_(total). N_(slots) may be one ortwo. N_(rep) may have a value varying among the slots. N_(rep) may havethe same value among the slots. A higher layer parameterfrequencyHopping may be configured (provided) for the terminal apparatus1. The higher layer parameter frequencyHopping may be set to one of‘intraSlot’ and ‘interSlot’. In a case that frequencyHopping is set to‘intraSlot’, the terminal apparatus 1 may transmit the PUSCH withintra-slot frequency hopping. In other words, configuring the intra-slotfrequency hopping for the terminal apparatus 1 may mean thatfrequencyHopping is set to ‘intraSlot’ and that the ‘Frequency hoppingflag’ field included in the DCI scheduling the PUSCH has a value setto 1. In a case that frequencyHopping is set to ‘interSlot’, theterminal apparatus 1 may transmit the PUSCH with inter-slot frequencyhopping. In other words, configuring the inter-slot frequency hoppingfor the terminal apparatus 1 may mean that the frequencyHopping is setto ‘interSlot’ and that the ‘Frequency hopping flag’ field included inthe DCI scheduling the PUSCH has a value set to 1. Additionally, in acase that the base station apparatus 3 does not transmitfrequencyHopping to the terminal apparatus 1, the terminal apparatus 1may perform the PUSCH transmission without frequency hopping. In otherwords, the lack of configuration of frequency hopping for the terminalapparatus 1 may include the lack of transmission of frequencyHopping.Additionally, the lack of configuration of frequency hopping for theterminal apparatus 1 may include setting, to 0, of the value of the‘Frequency hopping flag’ field included in the DCI scheduling the PUSCHdespite transmission of frequencyHopping.

FIG. 8 is a diagram illustrating an example of the frequency hoppingaccording to the present embodiment. FIG. 8(a) is an example of PUSCHtransmission without frequency hopping. FIG. 8(b) is an example of PUSCHtransmission with intra-slot frequency hopping. FIG. 8(c) is an exampleof PUSCH transmission with inter-slot frequency hopping. FIG. 8 may beapplied to the slot aggregation transmission. FIG. 8 may be applied tothe mini-slot aggregation transmission with one repetition transmissionwithin one slot.

In FIG. 8(b), the PUSCH transmission with intra-slot frequency hoppingincludes a first frequency hop (first hop or first frequency unit) and asecond frequency hop (first hop or second frequency unit) in the slot.The number of symbols for the first frequency hop may be given by Floor(N^(PUSCH,s) _(symb)/2). The number of symbols for the second frequencyhop may be given by N^(PUSCH,s) _(symb)−Floor (N^(PUSCH,s) _(symb)/2).N^(PUSCH,s) _(symb) is the length of one PUSCH transmission in OFDMsymbols within one slot. In other words, N^(PUSCH,s) _(symb) may be thenumber of OFDM symbols used for one PUSCH scheduled in one slot. Thevalue of N^(PUSCH,s) _(symb) may be indicated in a field included in theDCI format or the RAR UL grant. N^(PUSCH,s) _(symb) may be the number ofcontinuous allocated symbols obtained based on the ‘Time domain resourceassignment’ field included in the uplink grant scheduling transmissionof the transport block. The difference of the resource block RB_(offset)between the starting RB of the first frequency hop and the starting RBof the first frequency hop may be referred to as a resource blockfrequency offset. In other words, RB_(offset) is the RB frequency offsetbetween two frequency hops. Additionally, RB_(offset) may also bereferred to as a frequency offset for the second frequency hop. Forexample, the starting RB of the first frequency hop is referred to asRB_(start). The starting RB of the second frequency hop may be given by(Expression 5) (RB_(start+)RB_(offset)) mod N^(size) _(BWP). RB_(start)may be given by a frequency resource allocation field included in theDCI scheduling the PUSCH. N^(size) _(BWP) is the size of an activatedBWP (number of physical resource blocks). The function (A) mod (B)executes division of A and B, and outputs a number for a remainderresulting from the division. The value of the frequency offsetRB_(offset) is configured by a higher layer parameterfrequencyHoppingOffsetLists included in PUSCH-Config. The higher layerparameter frequencyHoppingOffsetLists is used to indicate a set offrequency offset (frequency hopping offset) values in a case that thefrequency hopping is applied. In FIG. 8(b), the intra-slot frequencyhopping may be applied to single-slot PUSCH transmission and/ormulti-slot (slot aggregation) PUSCH transmission.

In FIG. 8(c), inter-slot frequency hopping may be applied to multi-slotPUSCH transmission. RB_(offset) is an RB frequency offset between twofrequency hops. The starting RB of the PUSCH transmitted in a certainslot may be determined based on the number n^(u) _(s) of the slot. In acase that n^(u) _(s) mod 2 is 0, the starting RB of the PUSCH in theslot is RB_(start). In a case that n^(u) _(s) mod 2 is 1, the startingRB of the PUSCH in the slot may be given by (Expression 5)(RB_(start+)RB_(offset)) mod N^(size) _(BWP). RB_(start) may be given bythe frequency resource allocation field included in the DCI schedulingthe PUSCH. In FIG. 8(c), the terminal apparatus 1 repeatedly transmitsthe same transport block in two continuous slots.

The intra-slot frequency hopping may be applied to the single-slottransmission or slot aggregation transmission. The inter-slot frequencyhopping may be applied to the slot aggregation transmission.

FIG. 9 is a diagram illustrating another example of the determination ofthe number of repetition transmissions and the frequency hoppingaccording to the present embodiment. FIG. 9(a) is an example of PUSCHtransmission without frequency hopping. FIG. 9(b) is an example of PUSCHtransmission with intra-slot frequency hopping. FIG. 9(c) is anotherexample of PUSCH transmission with intra-slot frequency hopping. FIG.9(d) is an example of PUSCH transmission with inter-slot frequencyhopping. FIG. 9 may be applied to the slot aggregation transmission. Thefrequency hopping as illustrated in FIG. 9 may be applied to themini-slot aggregation transmission. Alternatively, the frequency hoppingas illustrated in FIG. 9 may be applied to the mini-slot aggregationtransmission in which one slot contains more than one repetitiontransmission. FIG. 9(a) illustrates a case where the frequency hoppingis not configured and where the slot aggregation is not configured orthe number of slot aggregation transmissions is one and the number ofmini-slot aggregation transmissions is four. In this case, N_(rep)=4,N_(total)=1, and N_(slots)=1.

In a case that frequencyHopping is set to ‘intraSlot’, the mini-slotaggregation transmission in the slot includes the first frequency hopand second frequency hop in the slot. The number of repetitiontransmissions included in the first frequency hop may be given by Floor(N_(rep)/2). The number of repetition transmissions included in thesecond frequency hop may be given by N_(rep)−Floor (N_(rep)/2). N_(rep)is the number of repetition transmissions of the same transport blockwithin the slot. The difference of the resource block RB_(offset)between the starting RB of the first frequency hop and the starting RBof the first frequency hop may be referred to as a resource blockfrequency offset. In other words, RB_(offset) is the RB frequency offsetbetween two frequency hops. Additionally, RB_(offset) may also bereferred to as a frequency offset for the second frequency hop. Forexample, the starting RB of the first frequency hop is referred to asRB_(start). The starting RB of the second frequency hop may be given by(Expression 5) (RB_(start+)RB_(offset)) mod N^(size) _(BWP). RB_(start)may be given by the frequency resource allocation field. The function(A) mod (B) executes division of A and B, and outputs a number for aremainder resulting from the division. In a case that N_(rep) is 1, thenumber of frequency hops may be one. In other words, in a case thatfrequencyHopping is set to ‘intraSlot’, the terminal apparatus 1 mayperform the PUSCH transmission without intra-slot frequency hopping. Thestarting RB of the PUSCH transmission without intra-slot frequencyhopping may be given by (Expression 5) (RB_(start+)RB_(offset)) modN^(size) _(BWP). Additionally, even in a case that N_(rep) is 1, thenumber of frequency hops may be considered two. In other words, thenumber of symbols for the first frequency hop may be zero. The number ofsymbols of the second frequency hop may be N_(rep)*N^(PUSCH,s) _(symb).

In FIG. 9(b), the total number N_(total) of repetition transmissions ofthe transport block is four. The total number N_(total) of repetitiontransmissions may be notified by a higher layer parameter and/or a fieldin the DCI scheduling the transport block transmission. In FIG. 9(b),N_(total) repetition transmissions of the transport block (N_(total)PUSCH transmissions) are performed within one slot. In FIG. 9(b), in oneslot, N_(rep)=4 PUSCH transmissions may include N_(rep)=4 repetitiontransmissions of the same transport block. The first frequency hopincludes the first (Floor (N_(rep)/2)=2) repetition transmissions. Thesecond frequency hop includes (N_(rep)−Floor (N_(rep)/2)=2) repetitiontransmissions. The first frequency hop includes symbols corresponding tothe first two repetition transmissions. The second frequency hopincludes symbols corresponding to the last two repetition transmissions.In this case, N_(rep)=4, N_(total)=1, and N_(slots)=1.

In FIG. 9(c), the number N_(total) of repetition transmissions of thetransport block is seven. N_(total) may be notified by a higher layerparameter and/or a field in the DCI scheduling the transport blocktransmission. In FIG. 9(c), N_(total) repetition transmissions of thetransport block are performed in two slots. The terminal apparatus 1 mayperform intra-slot frequency hopping for each of the slots for therepetition transmission of the transport block. In FIG. 9(c), in thefirst one slot, the PUSCH transmission may include N_(rep)=4 repetitiontransmissions of the same transport block. The first frequency hopincludes the first (Floor (N_(rep)/2)=2) repetition transmissions. Thesecond frequency hop includes (N_(rep)−Floor (N_(rep)/2)=2) repetitiontransmissions. The first frequency hop includes symbols corresponding tothe first two repetition transmissions in the slot. The second frequencyhop includes symbols corresponding to the last two repetitiontransmissions in the slot. In the next slot, the PUSCH transmission mayinclude N_(rep)=3 repetition transmissions of the same transport block.The first frequency hop includes the first (Floor (N_(rep)/2)=1)repetition transmissions. The second frequency hop includes(N_(rep)−Floor (N_(rep)/2)=2) repetition transmissions. The firstfrequency hop includes symbols corresponding to the first repetitiontransmission in the slot. The second frequency hop includes symbolscorresponding to the last two repetition transmissions in the slot. Thesymbols corresponding to one repetition transmission in a slot A may bethe same as or different from the symbols corresponding to onerepetition transmission in a slot B. The symbols corresponding to therespective repetition transmissions in the slot A or the slot B may bethe same or different from each other. At this time, N_(rep)=4 in theslot A, N_(rep)=3 in the slot B, N_(total)=7, and N_(slots)=2.

In FIG. 9(d), the total number N_(total) of repetition transmissions ofthe transport block is seven. The N_(total) repetition transmissions ofthe transport block are performed in two slots. The terminal apparatus 1may perform inter-slot frequency hopping with the transport blockrepeatedly transmitted. RB_(offset) is an RB frequency offset betweentwo frequency hops. The starting RB of the PUSCH transmitted in acertain slot may be determined based on the number n^(u) _(s) of theslot. In a case that n^(u) _(s) mod 2 is 0, the starting RB of the PUSCHin the slot is RB_(start). In a case that n^(u) _(s) mod 2 is 1, thestarting RB of the PUSCH in the slot may be given by (Expression 5)(RB_(start+)RB_(offset)) mod N^(size) _(BWP). RB_(start) may be given bythe frequency resource allocation field included in the DCI schedulingthe PUSCH. At this time, N_(rep)=4 in the slot A, N_(rep)=3 in the slotB, N_(total)=7, and N_(slots)=2.

In FIG. 9(d), for example, in a case that N_(total) notified is 4, theterminal apparatus 1 performs a total number of repetition transmissionswithin one slot (slot A). In other words, in the slot B, the terminalapparatus 1 need not perform repetition transmissions of the sametransport block. In this case, the terminal apparatus 1 may considerthat the inter-slot frequency hopping is not applied. In other words,the terminal apparatus 1 may consider that the frequency hopping is notconfigured, and may perform the PUSCH transmission without frequencyhopping. In other words, RB_(start) transmitted within the slot may begiven by the frequency resource allocation field included in the DCIrather than based on the slot number. Additionally, in this case, theintra-slot frequency hopping may be considered to be applied, and theintra-slot frequency hopping as illustrated in FIG. 9(b) may beperformed. At this time, N_(rep)=4 in the slot A, N_(rep)=0 in the slotB, N_(total)=4, and N_(slots)=1.

Another example of the intra-slot frequency hopping according to thepresent embodiment will be described below.

The terminal apparatus 1 configured with the intra-slot frequencyhopping may determine the first frequency hop and the second frequencyhop, based on the number of repetition transmissions of the sametransport block within one slot.

In a case that one slot contains one repetition transmission of the sametransport block, the terminal apparatus 1 may determine the number ofsymbols for the first frequency hop to be Floor (N^(PUSCH,s) _(symb)/2)and determine the number of symbols for the second frequency hop to beN^(PUSCH, s) _(symb)−Floor (N^(PUSCH,s) _(symb)/2). In other words, in acase that one slot contains one repetition transmission of the sametransport block, the number of symbols for the first frequency hop maybe given by Floor (N^(PUSCH,s) _(symb)/) 2), and the number of symbolsfor the second frequency hop may be given by N^(PUSCH,s) _(symb)−Floor(N^(PUSCH,s) _(symb)/2). Here, N^(PUSCH,s) _(symb) may be the length ofthe PUSCH transmission in OFDM symbols in one slot. The N^(PUSCH,s)_(symb) may be the number of continuous allocated symbols obtained basedon the ‘Time domain resource assignment’ field included in the uplinkgrant scheduling transmission of the transport block. In other words,N^(PUSCH,s) _(symb) may be the number of symbols corresponding to asingle repetition transmission of the transport block within one slot.

Additionally, in a case that one slot contains more than one repetitiontransmission of the same transport block, the terminal apparatus 1 maydetermine the number of repetition transmissions included in the firstfrequency hop to be Floor (N_(rep)/2) and determine the number ofrepetition transmissions included in the second frequency hop to beN_(rep)−Floor (N_(rep)/2). N_(rep) may be the number of repetitiontransmissions of the same transport block within the slot. In otherwords, in a case that one slot contains more than one repetitiontransmission of the same transport block, the number of repetitiontransmissions included in the first frequency hop may be given by Floor(N_(rep)/2), and the number of repetition transmissions included in thesecond frequency hop may be given by N_(rep)−Floor (N_(rep)/2). Thenumber of symbols for the first frequency hop may indicate symbolscorresponding to the repetition transmissions included in the firstfrequency hop. The number of symbols for the second frequency hop mayindicate symbols corresponding to the repetition transmissions includedin the second frequency hop. For example, the number of symbols for thefirst frequency hop may be given by Floor (N_(rep)/2)*L. The number ofsymbols for the second frequency hop may be given by (N_(rep)−Floor(N_(rep)/2))*L. Here, L may be the number of continuous allocatedsymbols obtained based on the ‘Time domain resource assignment’ fieldincluded in the uplink grant scheduling the repetition transmission ofthe transport block. In other words, L may be the number of symbolscorresponding to one repetition transmission of the transport blockwithin one slot. In other words, L may be N^(PUSCH,s) _(symb) asdescribed above. In other words, in a case that one slot contains onerepetition transmission of the same transport block, the slot maycontain two frequency hops.

Additionally, in a case that one slot contains more than one repetitiontransmission of the same transport block, the terminal apparatus 1configured with the intra-slot frequency hopping may determine thenumber of frequency hops within the slot to be N_(rep). N_(rep) may bethe number of repetition transmissions of the same transport blockwithin the slot. In other words, in a case that one slot contains morethan one repetition transmission of the same transport block, the numberof frequency hops within the slot may be the value of N_(rep). The firstfrequency hop may correspond to the first repetition transmission of thetransport block. The second frequency hop may correspond to the secondrepetition transmission of the transport block. The ith frequency hopmay correspond to the ith repetition transmission of the transportblock. The N_(rep)th frequency hop may correspond to the Nrepthrepetition transmission of the transport block. In other words, i takesa value ranging from 1 to N_(rep). The starting RB of the ((i−1) mod2=0)th frequency hop may be RB start. The starting RB of the ((i−1) mod2=1)th frequency hop may be given by (Expression 5) (RBstart+RBoffset)mod N^(size) _(BWP). As described above, RBstart may be given by afrequency resource allocation field included in the DCI for schedulingthe PUSCH. RBoffset is the RB frequency offset between two frequencyhops indicated by the higher layer parameter. In other words, RBoffsetis the RB frequency offset between the first frequency hop and thesecond frequency hop. Specifically, RBoffset is the RB frequency offsetbetween the ith frequency hop and the (i+1)th frequency hop. FIG. 20 isa diagram illustrating another example of the number of repetitiontransmissions and the frequency hopping according to the presentembodiment. The frequency hopping as illustrated in FIG. 20 may beapplied to the mini-slot aggregation transmission. FIG. 20 is an exampleof PUSCH transmission to which the intra-slot mini-slot transmissionwith intra-slot frequency hopping is applied. Alternatively, thefrequency hopping as shown in FIG. 20 may be applied to the mini-slotaggregation transmission with more than one repetition transmissionwithin one slot.

In FIG. 20, N_(total)=4, N_(rep)=4, and N_(slots)=1. In FIG. 20, theterminal apparatus 1 may perform intra-slot frequency hopping withrepetition transmissions of the transport block. The first frequency hopmay correspond to the first repetition transmission of the transportblock. The second frequency hop may correspond to the second repetitiontransmission of the transport block. The third frequency hop maycorrespond to the third repetition transmission of the transport block.The fourth frequency hop may correspond to the fourth repetitiontransmission of the transport block. The starting RBs of the firstfrequency hop and the third frequency hop may be RB start. The startingRBs of the second and fourth frequency hops may be given by (Expression5) as described above.

FIG. 18 is a diagram illustrating another example of the determinationof the number of repetition transmissions and the frequency hoppingaccording to the present embodiment. FIG. 18 assumes N_(total)=2. FIG.18(a) illustrates an example of the PUSCH transmission to which theintra-slot mini-slot transmission is applied without frequency hopping.FIG. 18(b) illustrates an example of the PUSCH transmission to which theinter-slot mini-slot transmission is applied without frequency hopping.FIG. 18(c) is an example of the PUSCH transmission to which theintra-slot mini slot transmission with intra-slot frequency hopping isapplied. FIG. 18(d) is an example of the PUSCH transmission to which theinter-slot mini-slot transmission with inter-slot frequency hopping isapplied. FIG. 18 may be applied in a case that the second aggregationtransmission is configured. The frequency hopping as illustrated in FIG.18 may be applied to the mini-slot aggregation transmission.Alternatively, the frequency hopping as illustrated in FIG. 18 may beapplied to the mini-slot aggregation transmission with more than onerepetition transmission within one slot.

In FIG. 18(a), N_(rep)=2, N_(total)=2, N_(slots)=1. For example, theterminal apparatus 1 may receive N_(total) by a higher layer parameterand/or a field in the DCI scheduling the transport block transmission.The terminal apparatus 1 may receive N_(rep) by a higher layer parameterand/or a field in the DCI scheduling the transport block transmission.The starting symbol S of the first PUSCH is given based on the PDCCHtransmitted from the base station apparatus 3 to the terminal apparatus1. The number L of continuous allocated symbols for the first PUSCH isgiven based on the PDCCH transmitted from the base station apparatus 3to the terminal apparatus 1. The starting symbol S for the second PUSCHmay be the first available symbol after the first PUSCH. The startingsymbol S for the second PUSCH may be the first symbol continuous withthe first PUSCH. The number L of continuous allocated symbols for thesecond PUSCH is given based on the PDCCH transmitted from the basestation apparatus 3 to the terminal apparatus 1. However, the continuousallocated symbols for the second PUSCH are symbols from the startingsymbol S of the second PUSCH to the last symbol of the slot and do notspan the next slot. Thus, in a case that L symbols from the startingsymbol S of the second PUSCH exceed the last symbol number of the slot,L is the number of symbols from the starting symbol S of the secondPUSCH to the last symbol number of the slot. In other words, theterminal apparatus 1 and the base station apparatus 3 may determine thenumber L of symbols for the second PUSCH, based on one, multiple, or allof the starting symbol S given based on the PDCCH, the number L ofsymbols given based on the PDCCH, and the number of symbols in the slot.In other words, it can be said that the mini-slot aggregation, thestarting symbol expansion, and the symbol number expansion are appliedto the second PUSCH. The terminal apparatus 1 and the base stationapparatus 3 may determine that N_(slots)=1 based on one, multiple, orall of N_(rep), N_(total), the starting symbol S given based on thePDCCH, the number L of symbols given based on the PDCCH, and the numberof symbols in the slot. Alternatively, the terminal apparatus 1 mayreceive, from the base station apparatus 3, information indicating thatN_(slots)=1. In FIG. 18(b), N_(rep)=1 in the slot A, N_(rep)=1 in theslot B, N_(total)=2, and N_(slots)=2. For example, the terminalapparatus 1 may receive N_(total) by a higher layer parameter and/or afield in the DCI scheduling the transport block transmission. Theterminal apparatus 1 may receive N_(rep) by a higher layer parameterand/or a field in the DCI scheduling the transport block transmission.The starting symbol S of the first PUSCH is given based on the PDCCHtransmitted from the base station apparatus 3 to the terminal apparatus1. The number L of continuous allocated symbols for the first PUSCH isgiven based on the PDCCH transmitted from the base station apparatus 3to the terminal apparatus 1. However, the continuous allocated symbolsfor the first PUSCH are symbols from the starting symbol S of the firstPUSCH to the last symbol of the slot given based on the PDCCH, and donot span the next slot. Thus, in a case that L symbols from the startingsymbol S of the first PUSCH exceed the last symbol number of the slot, Lis the number of symbols from the starting symbol S of the first PUSCHto the last symbol number of the slot. In other words, the terminalapparatus 1 and the base station apparatus 3 may determine the number Lof symbols for the first PUSCH based on one, multiple, or all of thestarting symbol S given based on the PDCCH, the number L of symbolsgiven based on the PDCCH, and the number of symbols in the slot. In acase that the mini-slot aggregation is not applied, the base stationapparatus need not execute special processing as long as the basestation apparatus reports the number L of symbols with such a value asnot to span the next slot. However, in a case of FIG. 18(b), L givenbased on the PDCCH may be a value obtained in consideration of twoslots, and thus the processing as described above is effective. Thestarting symbol S of the second PUSCH may be the first available symbolof the slot B. The starting symbol S of the second PUSCH may be thefirst symbol continuous with the first PUSCH. The number L of continuousallocated symbols for the second PUSCH is given based on the PDCCHtransmitted from the base station apparatus 3 to the terminal apparatus1. However, the continuous allocated symbols for the second PUSCH maycorrespond to the number of symbols left after some of the symbols areused for the first PUSCH transmission. In other words, L given based onthe PDCCH minus the number L of symbols for the first PUSCH may be thenumber L of symbols for the second PUSCH. In other words, the terminalapparatus 1 and the base station apparatus 3 may determine the number Lof symbols for the second PUSCH, based on one, multiple, or all of thestarting symbol S given based on the PDCCH, the number L of symbolsgiven based on the PDCCH, the number of symbols in the slot, and thenumber of symbols used for the first PUSCH. In other words, it can besaid that the starting symbol expansion and the symbol number expansionare applied to the second PUSCH. The terminal apparatus 1 and the basestation apparatus 3 may determine that N_(slots)=2 based on one,multiple, or all of N_(rep), N_(total), the starting symbol S givenbased on the PDCCH, the number L of symbols based on the PDCCH, and thenumber of symbols in the slot. Alternatively, the terminal apparatus 1may receive, from the base station apparatus 3, information indicatingthat N_(slots)=2.

In FIG. 18(b), N_(rep)=1 in the slot A, and N_(rep)=1 in the slot B, andthus FIG. 18(b) may be considered to illustrate slot aggregation. Inother words, FIG. 18(b) may illustrate symbol allocation expansion(starting symbol expansion and/or symbol number expansion) in the secondaggregation.

Compared to FIG. 18(a), FIG. 18(c) illustrates application of theintra-slot frequency hopping. N_(rep)=2, N_(total)=2, and N_(slots)=1,and thus the first frequency hop includes the first (Floor(N_(rep)/2)=1) repetition transmissions. The second frequency hopincludes (N_(rep)−Floor (N_(rep)/2)=1) repetition transmissions.

Compared to FIG. 18(b), FIG. 18(d) illustrates application of theinter-slot frequency hopping. The terminal apparatus 1 and the basestation apparatus 3 may determine, based on N_(slots), whether to applythe inter-slot frequency hopping or to apply the intra-slot frequencyhopping. For example, for N_(slot)=1, the intra-slot frequency hoppingis applied, and for N_(slots)=2, the intra-slot frequency hopping isapplied.

FIG. 19 is a diagram illustrating another example of the determinationof the number of repetition transmissions and the frequency hoppingaccording to the present embodiment. FIG. 19 assumes N_(total)=4. FIG.19(a) is an example of the PUSCH transmission to which the intra-slotmini-slot transmission is applied without frequency hopping. FIG. 19(b)is an example of the PUSCH transmission to which the inter-slotmini-slot transmission is applied without frequency hopping. FIG. 19(c)is an example of the PUSCH transmission to which the intra-slotmini-slot transmission with intra-slot frequency hopping is applied.FIG. 19(d) is an example of the PUSCH transmission to which theinter-slot mini-slot transmission with inter-slot frequency hopping isapplied. FIG. 19 may be applied in a case that the second aggregationtransmission is configured. The frequency hopping as illustrated in FIG.19 may be applied to the mini-slot aggregation transmission.Alternatively, the frequency hopping as illustrated in FIG. 19 may beapplied to the mini-slot aggregation transmission with more than onerepetition transmission within one slot.

In FIG. 19(a), N_(rep)=4, N_(total)=4, and N_(slots)=1. For example, theterminal apparatus 1 may receive N_(total) by a higher layer parameterand/or a field in the DCI scheduling the transport block transmission.The terminal apparatus 1 may receive N_(rep) by a higher layer parameterand/or a field in the DCI scheduling the transport block transmission.The starting symbol S of the first PUSCH is given based on the PDCCHtransmitted from the base station apparatus 3 to the terminal apparatus1. The number L of continuous allocated symbols for the first PUSCH isgiven based on the PDCCH transmitted from the base station apparatus 3to the terminal apparatus 1. The starting symbol S of the second PUSCHmay be the first available symbol after the first PUSCH. The startingsymbol S of the second PUSCH may be the first symbol continuous with thefirst PUSCH. The number L of continuous allocated symbols for the secondPUSCH is given based on the PDCCH transmitted from the base stationapparatus 3 to the terminal apparatus 1. Similarly, the starting symbolS of the Xth PUSCH may be the first available symbol after the X−1thPUSCH. The starting symbol S of the Xth PUSCH may be the first symbolcontinuous with the X−1th PUSCH. The number L of continuous allocatedsymbols for the Xth PUSCH is given based on the PDCCH transmitted fromthe base station apparatus 3 to the terminal apparatus 1.

However, the continuous allocated symbols for the Xth PUSCH are symbolsfrom the starting symbol S of the Xth PUSCH to the last symbol of theslot, and do not span the next slot. Thus, in a case that L symbols fromthe starting symbol S of the Xth PUSCH exceed the last symbol number ofthe slot, L is the number of symbols from the starting symbol S of thesecond PUSCH to the last symbol number of the slot. Additionally, theX+1th PUSCH transmission is performed in the next slot. Alternatively,the X+1th PUSCH transmission is not performed in the next slot. Whetherthe X+1th PUSCH transmission is performed may be determined based onN_(slots). For example, for N_(slots)=1, the X+1th PUSCH transmission isnot performed. For N_(slots)=2, the X+1th PUSCH is performed in the nextslot. Alternatively, whether the X+1th PUSCH transmission is performedmay be determined based on N_(rep). In other words, N_(rep)+1th PUSCHtransmission is not performed. Alternatively, whether the X+1th PUSCHtransmission is performed may be determined based on N_(total). In otherwords, N_(total)+1th PUSCH transmission is not performed. In otherwords, the terminal apparatus 1 and the base station apparatus 3 maydetermine the number L of symbols for the Xth PUSCH, based on one,multiple, or all of the starting symbol S given based on the PDCCH, thenumber L of symbols given based on the PDCCH, the number of symbols inthe slot, N_(total), N_(rep), and N_(slots). Additionally, whether theX+1th PUSCH transmission is performed may be determined based on one,multiple, or all of N_(total), N_(rep), and N_(slots). In other words,it can be said that the mini-slot aggregation, the starting symbolexpansion, and the symbol number expansion are applied to the PUSCHtransmission in FIG. 19(a). The terminal apparatus 1 and the basestation apparatus 3 may determine that N_(slots)=1 based on one,multiple, or all of N_(rep), N_(total), the starting symbol S givenbased on the PDCCH, the number L of symbols given based on the PDCCH,and the number of symbols in the slot. Alternatively, the terminalapparatus 1 may receive, from the base station apparatus 3, informationindicating that N_(slots)=1.

In FIG. 19(a), the starting symbol S of the first transmission occasionis given based on the PDCCH transmitted from the base station apparatus3 to the terminal apparatus 1. The number L of continuous allocatedsymbols on the first transmission occasion is given based on the PDCCHtransmitted from the base station apparatus 3 to the terminal apparatus1. In other words, the first transmission occasion is used fortransmission of the first PUSCH. The terminal apparatus 1 may transmitthe first PUSCH to the base station apparatus 3 on the firsttransmission occasion. The first PUSCH corresponds to the firstrepetition transmission of the transport block. One transmission of thePUSCH may increment the number of repetition transmissions of thetransport block by one. In other words, the Xth PUSCH corresponds to theXth repetition transmission of the repetition transmissions of thetransport block. The starting symbol S of the second transmissionoccasion may be the first available symbol after the first transmissionoccasion. The starting symbol S of the second transmission occasion maybe the first symbol continuous with the first transmission occasion. Thestarting symbol S of the second transmission occasion may be the firstavailable symbol after the PUSCH transmitted at the nearest time. Thestarting symbol S of the second transmission occasion may be the firstsymbol continuous with the PUSCH transmitted at the nearest time. On thesecond transmission occasion, the first PUSCH is the PUSCH transmittedat the nearest time. The number L of continuous allocated symbols forthe second transmission occasion is given based on the PDCCH transmittedfrom the base station apparatus 3 to the terminal apparatus 1. Thesecond PUSCH transmitted on the second transmission occasion correspondsto the second repetition transmission of the transport block.

Similarly, the starting symbol S of the Xth transmission occasion may bethe first available symbol after the X−1th transmission occasion. Thestarting symbol S of the Xth transmission occasion may be the firstsymbol continuous with the X−1th transmission occasion. The startingsymbol S of the Xth transmission occasion may be the first availablesymbol after the PUSCH transmitted at the nearest time. The startingsymbol S of the Xth transmission occasion may be the first symbolcontinuous with the PUSCH transmitted at the nearest time. The number Lof continuous allocated symbols for the Xth transmission occasion isgiven based on the PDCCH transmitted from the base station apparatus 3to the terminal apparatus 1. The symbols for the Xth transmissionoccasion may be available symbols. In addition, some or all of thesymbols for the Xth transmission occasion may be unavailable symbols. Inother words, not all of the symbols included in the transmissionoccasion can be used for transmission of the PUSCH. At this time, in acase that the number (maximum number) of continuous available symbols onthe transmission occasion is equal to or greater than a first value, theterminal apparatus 1 may transmit the PUSCH to the base stationapparatus 3 by using the continuous available symbols. In a case thatthe number (maximum number) of continuous available symbols on thetransmission occasion is less than the first value, the terminalapparatus 1 need not transmit the PUSCH to the base station apparatus 3on the transmission occasion. In this case, the first value may beindicated by a higher layer parameter. The first value may be determinedbased at least on the symbol L given based on the PDCCH. For example,the first value may be given by ceiling (L*F). F may be a value lessthan 1. Additionally, the first value may be given by (L−T). T may beequal to or greater than 1. The value of F or T may be indicated by ahigher layer parameters. The value of F or T may correspond to differentvalues of L.

However, the continuous allocated symbols for the Xth transmissionoccasion are symbols from the starting symbol S of the Xth transmissionoccasion to the last symbol of the slot, and do not span the next slot.Thus, L symbols from the starting symbol S of the Xth transmissionoccasion corresponds to the number of symbols up to last symbol numberof the slot. Additionally, the X+1th transmission occasion may be in thenext slot. In this case, the starting symbol S of the X+1th transmissionoccasion may be the first available symbol of the slot. The startingsymbol S of the X+1th transmission occasion may be the first symbol ofthe slot. The number L of continuous allocated symbols for the X+1thtransmission occasion is given based on the PDCCH transmitted from thebase station apparatus 3 to the terminal apparatus 1.

The method for determining the starting symbol of each PUSCH and thenumber of symbols for the PUSCH as described above may also be used forthe slot aggregation. FIG. 21 is a diagram illustrating an example ofthe slot aggregation transmission (second aggregation transmission)according to the present embodiment. For example, FIG. 21(A) illustratesa case where N_(rep)=1, N_(total)=3, and N_(slot)=3. The starting symbolS of the first transmission occasion is given based on the PDCCHtransmitted from the base station apparatus 3 to the terminal apparatus1. The number L of continuous allocated symbols for the firsttransmission occasion (slot) is given based on the PDCCH transmittedfrom the base station apparatus 3 to the terminal apparatus 1. In otherwords, the first transmission occasion (slot) is used for transmissionof the first PUSCH. The terminal apparatus 1 may transmit the firstPUSCH to the base station apparatus 3 on the first transmission occasion(slot). The first PUSCH corresponds to the first repetition transmissionof the transport block. One transmission of the PUSCH may increment thenumber of repetition transmissions of the transport block by one. Inother words, the Xth PUSCH corresponds to the Xth repetitiontransmission of the repetition transmissions of the transport block. Thestarting symbol S of the second transmission occasion (slot) may be thefirst available symbol of the slot next to the first transmissionoccasion (slot). The number L of continuous allocated symbols for thesecond transmission occasion (slot) is given based on the PDCCHtransmitted from the base station apparatus 3 to the terminal apparatus1. The second PUSCH transmitted on the second transmission occasioncorresponds to the second repetition transmission of the transportblock. Similarly, the starting symbol S of the Xth transmission occasion(slot) may be the first available symbol of the slot next to the X−1thtransmission occasion (slot). The number L of continuous allocatedsymbols for the Xth transmission occasion (slot) is given based on thePDCCH transmitted from the base station apparatus 3 to the terminalapparatus 1. The symbols for the Xth transmission occasion (slot) may beavailable symbols. Furthermore, some or all of the symbols for the Xthtransmission occasion (slot) may be unavailable symbols. In other words,not all of the symbols included in the transmission occasion (slot) canbe used for transmission of the PUSCH. At this time, in a case that thenumber (maximum number) of continuous available symbols on thetransmission occasion (slot) is equal to or greater than a first value,the terminal apparatus 1 may transmit the PUSCH to the base stationapparatus 3 by using the continuous available symbols. In a case thatthe number (maximum number) of continuous available symbols on thetransmission occasion (slot) is less than the first value, the terminalapparatus 1 need not transmit the PUSCH to the base station apparatus 3on the transmission occasion (slot). In this case, the first value maybe indicated by a higher layer parameter. The first value may bedetermined based at least on the symbol L given based on the PDCCH. Forexample, the first value may be given by ceiling (L*F). F may be a valueless than 1. Additionally, the first value may be given by (L−T). T maybe equal to or greater than 1. The value of F or T may be indicated by ahigher layer parameter. The value of F or T may correspond to each ofdifferent values of L.

Additionally, the slot in which the slot aggregation transmission isperformed may include a burst of two or more available symbols. Forexample, in FIG. 21(B), the slot B has a burst 201 of available symbolsand a burst 202 of available symbols. Each burst of available symbolsincludes continuous available symbols in the slot. Unavailable symbolsare present between the bursts 201 and 202. The terminal apparatus 1 maytransmit the PUSCH (second) to the base station apparatus 3 in the slotB by using one of the burst 201 and burst 202. The number of symbolsincluded in the burst 202 is greater than the number of symbols includedin the burst 201. The terminal apparatus 1 may transmit the PUSCH to thebase station apparatus 3 by using one of the multiple bursts that hasthe maximum length (the maximum number of available symbols). In otherwords, the terminal apparatus 1 may transmit the PUSCH to the basestation apparatus 3 in the burst 202. Additionally, the terminalapparatus 1 may transmit the PUSCH to the base station apparatus 3 byusing the earliest one of the multiple bursts. In other words, theterminal apparatus 1 may transmit the PUSCH to the base stationapparatus 3 in the burst 201. Additionally, the terminal apparatus 1 maytransmit the PUSCH to the base station apparatus 3 by using the earliestone of the multiple bursts of the same length. In other words, in a casethat the same number of symbols are included in the burst 201 and in theburst 202, the terminal apparatus 1 may transmit the PUSCH to the basestation apparatus 3 in the burst 201. In addition, the terminalapparatus 1 may transmit the PUSCH to the base station apparatus 3 byusing the earliest one of the multiple bursts that is equal to orgreater than the first value, as described above. In other words, thestarting symbol S of the PUSCH transmitted in the slot B may be thefirst symbol (the first available symbol) of the burst to be used fortransmission. The number of continuous allocated symbols for the PUSCHtransmitted in the slot B may be the number L of continuous allocatedsymbols given based on the PDCCH transmitted from the base stationapparatus 3 to the terminal apparatus 1.

Thus, in a case that L symbols from the first symbol of the burst usedfor transmission exceeds the last symbol number of the burst, L is thenumber of symbols from the first symbol of the burst used fortransmission to the last symbol number of the burst. Alternatively, thenumber of continuous allocated symbols of the PUSCH transmitted in theslot B may be the length of the burst used for transmission. In otherwords, the number of continuous allocated symbols of the PUSCHtransmitted in the slot B corresponds to symbols from the first symbolin the burst used for transmission to the last symbol in the burst, andthe symbols do not span beyond the burst. The terminal apparatus 1 andthe base station apparatus 3 may determine the number L of symbols forthe transmitted PUSCH, based on one, multiple, or all of the startingsymbol S given based on the PDCCH, the number L of symbols given basedon the PDCCH, the number of symbols in the slot, the number of bursts,the number of symbols in the burst, N_(total), N_(rep), and N_(slots).This method may be generalized and used for the slot A, the slot B,and/or a slot C.

In FIG. 19(b), N_(rep)=2 in the slot A, N_(rep)=2 in the slot B, andN_(total)=4, and N_(slots)=2. As is the case with FIG. 19(a), theterminal apparatus 1 and the base station apparatus 3 may determine thenumber L of symbols for the Xth PUSCH, based on one, multiple, or all ofthe starting symbol S given based on the PDCCH, the number L of symbolsgiven based on the PDCCH, the number of symbols in the slot, N_(total),N_(rep), and N_(slots). Additionally, whether the X+1th PUSCHtransmission is performed may be determined based on one, multiple, orall of N_(total), N_(rep), and N_(slots).

Compared to FIG. 19(a), FIG. 19(c) illustrates application of theintra-slot frequency hopping. N_(rep)=4, N_(total)=4, and N_(slots)=1,and thus the first frequency hop includes the first (Floor(N_(rep)/2)=2) repetition transmissions. The second frequency hopincludes (N_(rep)−Floor (N_(rep)/2)=2) repetition transmissions.

Compared to FIG. 19(b), FIG. 19(d) illustrates application of theinter-slot frequency hopping. The terminal apparatus 1 and the basestation apparatus 3 may determine, based on N_(slots), whether to applythe inter-slot frequency _(hopping) or to apply the intra-slot frequencyhopping. For example, for N_(slot)=1, the intra-slot frequency hoppingis applied, and for N_(slots)=2, the intra-slot frequency hopping isapplied.

In the present embodiment, in the formula related to the intra-slotfrequency hopping, the ceiling function may be utilized instead of theFloor function. As an example, for Expression Floor (N_(rep)/2), theceiling function may be utilized instead of the Floor function to changeFloor (N_(rep)/2) to ceiling (N_(rep)/2).

In the uplink transmission of the present embodiment, the availablesymbols may be symbols indicated as being flexible and/or uplink by atleast a higher layer parameter TDD-UL-DL-ConfigurationCommon and/orTDD-UL-DL-ConfigDedicated. In other words, the available symbols are notsymbols indicated as downlink by the higher layer parameterTDD-UL-DL-ConfigurationCommon and/or TDD-UL-DL-ConfigDedicated. Thehigher layer parameter TDD-UL-DL-ConfigurationCommon and/orTDD-UL-DL-ConfigDedicated is used to determine an uplink/downlink TDDconfiguration. The unavailable symbols may be symbols that are notavailable symbols.

However, the available symbols are not symbols indicated by at least ahigher layer parameter ssb-PositionsInBurst. ssb-PositionsInBurst isused to indicate the time domain position of the SS/PBCH blocktransmitted to the base station apparatus 3. In other words, theterminal apparatus 1 recognizes the position of the symbol in which theSS/PBCH block is transmitted by ssb-PositionsInBurst. The symbol inwhich the SS/PBCH block is transmitted may be referred to as an SS/PBCHblock symbol. In other words, the available symbols are not SS/PBCHblock symbols.

However, the available symbols are at least not symbols indicated bypdcch-ConfigSIB1. In other words, the available symbols are not symbolsindicated by pdcch-ConfigSIB1 for the CORESET for the Type0-PDCCH commonsearch space set. pdcch-ConfigSIB1 may be included in the MIB orServingCellConfigCommon.

Thus, the terminal apparatus 1 can transmit uplink data to the basestation apparatus 3.

Configurations of apparatuses according to the present embodiment willbe described below.

FIG. 22 is a schematic block diagram illustrating a configuration of theterminal apparatus 1 according to the present embodiment. Asillustrated, the terminal apparatus 1 is configured to include a radiotransmission and/or reception unit 10 and a higher layer processing unit14. The radio transmission and/or reception unit 10 is configured toinclude an antenna unit 11, a Radio Frequency (RF) unit 12, and abaseband unit 13. The higher layer processing unit 14 includes a mediumaccess control layer processing unit 15 and a radio resource controllayer processing unit 16. The radio transmission and/or reception unit10 is also referred to as a transmitter, a receiver, a monitor unit, ora physical layer processing unit. The higher layer processing unit 14 isalso referred to as a measurement unit, a selection unit, or a controlunit 14.

The higher layer processing unit 14 outputs uplink data (that may bereferred to as transport block) generated by a user operation or thelike, to the radio transmission and/or reception unit 10. The higherlayer processing unit 14 performs a part or all of the processing of theMedium Access Control (MAC) layer, the Packet Data Convergence Protocol(PDCP) layer, the Radio Link Control (RLC) layer, and the Radio ResourceControl (RRC) layer. The higher layer processing unit 14 functions todetermine whether to repeatedly transmit the transport block, based onhigher layer signaling received from the base station apparatus 3. Thehigher layer processing unit 14 determines, based on the higher layersignaling received from the base station apparatus 3, whether to performthe first aggregation transmission and/or the second aggregationtransmission. The higher layer processing unit 14 functions to controlthe symbol allocation expansion (starting symbol expansion and/or symbolnumber expansion), the number of dynamic repetitions, and/or themini-slot aggregation transmission for the aggregation transmission (thesecond aggregation transmission), based on the higher layer signalingreceived from the base station apparatus 3. The higher layer processingunit 14 determines whether to perform the frequency hopping transmissionof the transport block, based on the higher layer signaling receivedfrom the base station apparatus 3. The higher layer processing unit 14functions to control the configuration of the first frequency hop andthe second frequency hop, based on the number of repetitiontransmissions of the same transport block within one slot. The higherlayer processing unit 14 outputs frequency hopping information,aggregation transmission information, and the like to the radiotransmission and/or reception unit 10.

The higher layer processing unit 14 functions to control the secondnumber, based on the higher layer signaling including the first numberof repetition transmissions and/or the DCI field including the firstnumber. The first number may be the number of repetition transmissionsof the same transport block within a slot and across slots. The secondnumber may be the number of repetition transmissions of the sametransport block within a slot.

The medium access control layer processing unit 15 included in thehigher layer processing unit 14 performs processing of the Medium AccessControl layer (MAC layer). The medium access control layer processingunit 15 controls transmission of a scheduling request, based on varioustypes of configuration information/parameters managed by the radioresource control layer processing unit 16.

The radio resource control layer processing unit 16 included in thehigher layer processing unit 14 performs processing of the RadioResource Control layer (RRC layer). The radio resource control layerprocessing unit 16 manages various types of configurationinformation/parameters of the terminal apparatus 1. The radio resourcecontrol layer processing unit 16 sets various types of configurationinformation/parameters based on a higher layer signaling received fromthe base station apparatus 3. In other words, the radio resource controllayer processing unit 16 sets the various configurationinformation/parameters based on the information indicating the variousconfiguration information/parameters received from the base stationapparatus 3. The radio resource control layer processing unit 16controls (identifies) the resource allocation, based on the downlinkcontrol information received from the base station apparatus 3.

The radio transmission and/or reception unit 10 performs processing ofthe physical layer, such as modulation, demodulation, coding, anddecoding. The radio transmission and/or reception unit 10 demultiplexes,demodulates, and decodes a signal received from the base stationapparatus 3, and outputs the information resulting from the decoding tothe higher layer processing unit 14. The radio transmission and/orreception unit 10 generates a transmit signal by modulating and codingdata, and performs transmission to the base station apparatus 3. Theradio transmission and/or reception unit 10 outputs, to the higher layerprocessing unit 14, the higher layer signaling (RRC message), DCI, andthe like received from the base station apparatus 3. Additionally, theradio transmission and/or reception unit 10 generates and transmits anuplink signal, based on an indication from the higher layer processingunit 14. The radio transmission and/or reception unit 10 can repeatedlytransmit the transport block to the base station apparatus 3, based onan indication from the higher layer processing unit 14. In a case thatthe repetition transmission of the transport block is configured, theradio transmission and/or reception unit 10 repeatedly transmits thesame transport block. The number of repetition transmissions is givenbased on an indication from the higher layer processing unit 14. Theradio transmission and/or reception unit 10 transmits the PUSCH in theaggregation transmission, based on information related to the firstnumber of repetitions, the first number, and the second number which areindicated by the higher layer processing unit 14. The radio transmissionand/or reception unit 10 can control the aggregation transmission, basedon prescribed conditions. Specifically, the radio transmission and/orreception unit 10 functions, in a case of satisfying a first condition,to apply the same symbol allocation to each slot and repeatedly transmitthe transport block N times in continuous N slots in a case that thesecond aggregation transmission parameter is configured and to transmitthe transport block once in a case that the second aggregationtransmission parameter is not configured. Here, the value of N isindicated in the second aggregation transmission parameter.Additionally, the radio transmission and/or reception unit 10 functions,in a case of satisfying a second condition, to apply the mini-slotaggregation transmission and transmit the transport block. The firstcondition at least includes the DCI received from the base stationapparatus 3 and indicating the PUSCH mapping type as the type A. Thesecond condition at least includes the DCI received from the basestation apparatus 3 and indicating the PUSCH mapping type as the type B.

The RF unit 12 converts (down converts) a signal received via theantenna unit 11 into a baseband signal by orthogonal demodulation andremoves unnecessary frequency components. The RF unit 12 outputs aprocessed analog signal to the baseband unit.

The baseband unit 13 converts the analog signal input from the RF unit12 into a digital signal. The baseband unit 13 removes a portioncorresponding to a Cyclic Prefix (CP) from the converted digital signal,performs a Fast Fourier Transform (FFT) on the signal from which the CPhas been removed, and extracts a signal in the frequency domain.

The baseband unit 13 generates an OFDM symbol by performing Inverse FastFourier Transform (IFFT) on the data, adds CP to the generated OFDMsymbol, generates a baseband digital signal, and converts the basebanddigital signal into an analog signal. The baseband unit 13 outputs theconverted analog signal to the RF unit 12.

The RF unit 12 removes unnecessary frequency components from the analogsignal input from the baseband unit 13 through a low-pass filter, upconverts the analog signal into a signal of a carrier frequency, andtransmits the up converted signal via the antenna unit 11. Also, the RFunit 12 amplifies power. Additionally, the RF unit 12 may function todetermine transmit power for an uplink signal and/or an uplink channeltransmitted in the serving cell. The RF unit 12 is also referred to as atransmit power controller.

FIG. 23 is a schematic block diagram illustrating a configuration of thebase station apparatus 3 according to the present embodiment. Asillustrated, the base station apparatus 3 is configured to include aradio transmission and/or reception unit 30 and a higher layerprocessing unit 34. The radio transmission and/or reception unit 30 isconfigured to include an antenna unit 31, an RF unit 32, and a basebandunit 33. The higher layer processing unit 34 includes a medium accesscontrol layer processing unit 35 and a radio resource control layerprocessing unit 36. The radio transmission and/or reception unit 30 isalso referred to as a transmitter, a receiver, a monitor unit, or aphysical layer processing unit. A controller controlling operations ofthe units based on various conditions may be separately provided. Thehigher layer processing unit 34 is also referred to as a control unit34.

The higher layer processing unit 34 performs processing for some or allof the Medium Access Control (MAC) layer, the Packet Data ConvergenceProtocol (PDCP) layer, the Radio Link Control (RLC) layer, and the RadioResource Control (RRC) layer. The higher layer processing unit 34functions to determine whether to repeatedly transmit the transportblock, based on the higher layer signaling transmitted to the terminalapparatus 1. The higher layer processing unit 34 determines, based onthe higher layer signaling transmitted to the terminal apparatus 1,whether to perform the first aggregation transmission and/or the secondaggregation transmission. The higher layer processing unit 34 functionsto control the symbol allocation expansion (starting symbol expansionand/or symbol number expansion), the number of dynamic repetitions,and/or the mini-slot aggregation transmission for the aggregationtransmission (the second aggregation transmission), based on the higherlayer signaling transmitted to the terminal apparatus 1. The higherlayer processing unit 34 determines whether to perform the frequencyhopping transmission of the transport block, based on the higher layersignaling transmitted to the terminal apparatus 1. The higher layerprocessing unit 34 functions to control the configuration of the firstfrequency hop and the second frequency hop, based on the number ofrepetition transmissions of the same transport block within one slot.The higher layer processing unit 34 outputs the frequency hoppinginformation, the aggregation transmission information, and the like tothe radio transmission and/or reception unit 30.

The higher layer processing unit 34 functions to control the secondnumber, based on the higher layer signaling including the first numberof repetition transmissions and/or the DCI field including the firstnumber. The first number may be the number of repetition transmissionsof the same transport block within a slot and across slots. The secondnumber may be the number of repetition transmissions of the sametransport block within a slot.

The medium access control layer processing unit 35 included in thehigher layer processing unit 34 performs processing of the MAC layer.The medium access control layer processing unit 35 performs processingassociated with a scheduling request, based on various types ofconfiguration information/parameters managed by the radio resourcecontrol layer processing unit 36.

The radio resource control layer processing unit 36 included in thehigher layer processing unit 34 performs processing of the RRC layer.The radio resource control layer processing unit 36 generates, for theterminal apparatus 1, downlink control information (uplink grant anddownlink grant) including resource allocation information. The radioresource control layer processing unit 36 generates or acquires from ahigher node, downlink control information, downlink data (transportblock and random access response) mapped to a physical downlink sharedchannel, system information, an RRC message, a MAC Control Element (CE),and the like, and outputs the generated or acquired data and the like tothe radio transmission and/or reception unit 30. Further, the radioresource control layer processing unit 36 manages various types ofconfiguration information/parameters for each terminal apparatus 1. Theradio resource control layer processing unit 36 may set various types ofconfiguration information/parameters for each terminal apparatus 1 viahigher layer signals. In other words, the radio resource control layerprocessing unit 36 transmits/broadcasts information indicating varioustypes of configuration information/parameters. The radio resourcecontrol layer processing unit 36 may transmit/report information foridentifying a configuration of one or multiple reference signals in acertain cell.

In a case that the base station apparatus 3 transmits the RRC message,the MAC CE, and/or the PDCCH to the terminal apparatus 1, and theterminal apparatus 1 performs processing, based on the reception, thebase station apparatus 3 performs processing (control of the terminalapparatus 1 and the system) assuming that the terminal apparatus isperforming the above-described processing. In other words, the basestation apparatus 3 sends, to the terminal apparatus 1, the RRC message,MAC CE, and/or PDCCH intended to cause the terminal apparatus to performthe processing based on the reception.

The radio transmission and/or reception unit 30 transmits higher layersignaling (RRC message), DCI, and the like to the terminal apparatus 1.The radio transmission and/or reception unit 30 receives the uplinksignal transmitted from the terminal apparatus 1 based on an indicationfrom the higher layer processing unit 34. The radio transmission and/orreception unit 30 can receive the repetition transmission of thetransport block from the terminal apparatus 1, based on an indicationfrom the higher layer processing unit 34. In a case that the repetitiontransmission of the transport block is configured, the radiotransmission and/or reception unit 30 receives the repetitiontransmission of the same transport block. The number of repetitiontransmissions is given based on an indication from the higher layerprocessing unit 34. The radio transmission and/or reception unit 30receives the PUSCH in the aggregation transmission, based on theinformation related to the first number of repetitions, the firstnumber, and the second number which are indicated by the higher layerprocessing unit 34. The radio transmission and/or reception unit 30 cancontrol the aggregation transmission, based on prescribed conditions.Specifically, the radio transmission and/or reception unit 30 functions,in a case of satisfying a first condition, to apply the same symbolallocation to each slot and repeatedly receive the transport block Ntimes in continuous N slots in a case that the second aggregationtransmission parameter is configured and to receive the transport blockonce in a case that the second aggregation transmission parameter is notconfigured. Here, the value of N is indicated in the second aggregationtransmission parameter. The radio transmission and/or reception unit 30functions, in a case of satisfying a second condition, to receive thetransport block by applying the mini-slot aggregation transmission. Thefirst condition at least includes the DCI transmitted to the terminalapparatus 1 and indicating the PUSCH mapping type as the type A. Thesecond condition at least includes the DCI transmitted to the terminalapparatus 1 and indicating the PUSCH mapping type as the type B. Inaddition, some of the functions of the radio transmission and/orreception unit 30 are similar to the corresponding functions of theradio transmission and/or reception unit 10, and thus description ofthese functions is omitted. Note that in a case that the base stationapparatus 3 is connected to one or multiple transmission receptionpoints 4, some or all of the functions of the radio transmission and/orreception unit 30 may be included in each of the transmission receptionpoints 4.

Further, the higher layer processing unit 34 transmits (transfers) orreceives control messages or user data between the base stationapparatuses 3 or between a higher network apparatus (MME, S-GW(Serving-GW)) and the base station apparatus 3. Although, in FIG. 23,other constituent elements of the base station apparatus 3, atransmission path of data (control information) between the constituentelements, and the like are omitted, it is apparent that the base stationapparatus 3 is provided with multiple blocks, as constituent elements,including other functions necessary to operate as the base stationapparatus 3. For example, a radio resource management layer processingunit or an application layer processing unit reside in the higher layerprocessing unit 34.

Note that “units” in the drawing refer to constituent elements torealize the functions and the procedures of the terminal apparatus 1 andthe base station apparatus 3, which are also represented by the termssuch as a section, a circuit, a constituting apparatus, a device, aunit, and the like.

Each of the units having the reference signs 10 to 16 included in theterminal apparatus 1 may be implemented as a circuit. Each of the unitshaving the reference signs 30 to 36 included in the base stationapparatus 3 may be implemented as a circuit.

(1) More specifically, a terminal apparatus 1 according to a firstaspect of the present invention includes a receiver receiver 10configured to receive an RRC message including a first aggregationtransmission parameter and to receive DCI, a transmitter 10 configuredto transmit a PUSCH scheduled by the DCI. In a case of satisfying afirst condition, the transmitter 10 applies the same symbol allocationin multiple slots and repeatedly transmits a transport block N times incontinuous N slots in a case that a second aggregation transmissionparameter is configured, a value of N being indicated in the secondaggregation transmission parameter, and the transmitter 10 transmits thetransport block once in a case that the second aggregation transmissionparameter is not configured, and in a case of satisfying a secondcondition, the transmitter 10 transmits, by applying mini-slotaggregation transmission, the transport block.

(2) A base station apparatus 3 according to a second aspect of thepresent invention includes a transmitter 30 configured to transmit anRRC message including a first aggregation transmission parameter and totransmit DCI, and a receiver 30 configured to receive a PUSCH scheduledby the DCI. In a case that a first condition is satisfied, the samesymbol allocation is applied in multiple slots and a transport block isrepeatedly received N times in continuous N slots in a case that asecond aggregation transmission parameter is configured, a value of Nbeing indicated in the second aggregation transmission parameter, and ina case that the second aggregation transmission parameter is notconfigured, the transport block is received once, and in a case that asecond condition is satisfied, mini-slot aggregation transmission isapplied and the transport block is received.

(3) In the first aspect or the second aspect of the present invention,in the mini-slot aggregation transmission, the same transport block isrepeatedly transmitted once or more than once within one slot.

(4) In the first aspect or the second aspect of the present invention,the first condition at least includes the DCI indicating a PUSCH mappingtype as a type A.

(5) In the first aspect or the second aspect of the present invention,the second condition at least includes the DCI indicating a PUSCHmapping type as a type B.

(6) A terminal apparatus 1 according to a third aspect of the presentinvention includes a receiver 10 configured to receive an uplink grant,and a transmitter 10 configured to transmit a PUSCH including frequencyhopping for which the uplink grant is scheduled. The PUSCH includesN_(rep) repetition transmissions of the same transport block within oneslot, and the PUSCH includes a first frequency hop and a secondfrequency hop in one slot, and in a case that the N_(rep) is 1, thefirst frequency hop includes Floor (L/2) symbols and the secondfrequency hop includes L−Floor (L/2) symbols, and the L is the number ofsymbols corresponding to one repetition transmission of the N_(rep)repetition transmissions, and in a case that the N_(rep) is greater thanone, the first frequency hop includes symbols corresponding to firstFloor (N_(rep)/2) repetition transmissions of the N_(rep) repetitiontransmissions, and the second frequency hop includes symbolscorresponding to N_(rep)−Floor (N_(rep)/2) repetition transmissions ofthe N_(rep) repetition transmissions.

(7) A base station apparatus 3 according to a fourth aspect of thepresent invention includes: a transmitter 30 configured to transmit anuplink grant, and a receiver 30 configured to receive a PUSCH includingfrequency hopping for which the uplink grant is scheduled.

The PUSCH includes N_(rep) repetition transmissions of the sametransport block within one slot, and the PUSCH includes a firstfrequency hop and a second frequency hop in one slot, and in a case thatthe N_(rep) is 1, the first frequency hop includes Floor (L/2) symbolsand the second frequency hop includes L−Floor (L/2) symbols, and the Lis the number of symbols corresponding to one reception transmission ofthe N_(rep) repetition transmissions, and in a case that the N_(rep) isgreater than one, the first frequency hop includes symbols correspondingto first Floor (N_(rep)/2) repetition transmissions of the N_(rep)repetition transmissions, and the second frequency hop includes symbolscorresponding to N_(rep)−Floor (N_(rep)/2) repetition transmissions ofthe N_(rep) repetition transmissions.

(8) In the third aspect or the fourth aspect of the present invention,the number of symbols corresponding to each of the repetitiontransmissions of the same transport block within one slot may be thesame or vary.

(9) In the third aspect or the fourth aspect of the present invention,the N_(rep) repetition transmissions are continuously ornon-continuously transmitted within one slot.

(10) A terminal apparatus 1 according to a fifth aspect of the presentinvention includes a receiver 10 configured to receive an RRC messageincluding a first aggregation transmission parameter and to receive DCI,and a transmitter 10 configured to transmit a PUSCH scheduled by theDCI. The first aggregation transmission parameter includes informationrelated to a first number of repetitions, a field in the DCI includes afirst number, and a second number is calculated based on the firstnumber, and the transmitter transmits the PUSCH in aggregationtransmission, based on the information related to the first number ofrepetitions, the first number, and the second number.

(11) A base station apparatus 3 according to a sixth aspect of thepresent invention includes a transmitter 30 configured to transmit anRRC message including a first aggregation transmission parameter and totransmit DCI, and a receiver 30 configured to receive a PUSCH scheduledby the DCI. The first aggregation transmission parameter includesinformation related to a first number of repetitions, a field in the DCIincludes a first number, and a second number is calculated based on thefirst number, and the receiver receives the PUSCH in aggregationtransmission, based on the information related to the first number ofrepetitions, the first number, and the second number.

(12) In the fifth aspect or the sixth aspect of the present invention,the first number is the number of repetition transmissions of the sametransport block within a slot and across slots, and the second number isthe number of repetition transmissions of the same transport blockwithin a slot.

(13) In the fifth aspect or the sixth aspect of the present invention,the first number is the number of repetition transmissions of the sametransport block within a slot, and the second number is the number ofrepetition transmissions of the same transport block within a slot andacross slots.

(14) In the fifth aspect or the sixth aspect of the present invention,the number of repetition transmissions of the same transport blockwithin a slot, and the second number is the number of slots used forrepetition transmissions of the same transport block.

With this configuration, the terminal apparatus 1 is capable ofefficiently communicating with the base station apparatus 3.

A program running on an apparatus according to the present invention mayserve as a program that controls a Central Processing Unit (CPU) and thelike to cause a computer to operate in such a manner as to realize thefunctions of the above-described embodiment according to the presentinvention. Programs or the information handled by the programs aretemporarily stored in a volatile memory such as a Random Access Memory(RAM), a non-volatile memory such as a flash memory, a Hard Disk Drive(HDD), or any other storage device system.

Note that a program for realizing the functions of the embodimentsaccording to the present invention may be recorded in acomputer-readable recording medium. It may be implemented by causing acomputer system to read and execute the program recorded on thisrecording medium. It is assumed that the “computer system” refers to acomputer system built into the apparatuses, and the computer systemincludes an operating system and hardware components such as aperipheral device. Furthermore, the “computer-readable recording medium”may be any of a semiconductor recording medium, an optical recordingmedium, a magnetic recording medium, a medium dynamically retaining theprogram for a short time, or any other computer readable recordingmedium.

Furthermore, each functional block or various characteristics of theapparatuses used in the above-described embodiment may be implemented orperformed on an electric circuit, for example, an integrated circuit ormultiple integrated circuits. An electric circuit designed to performthe functions described in the present specification may include ageneral purpose processor, a digital signal processor (DSP), anapplication specific integrated circuit (ASIC), a field programmablegate array (FPGA), or other programmable logic devices, discrete gatesor transistor logic, discrete hardware components, or a combinationthereof. The general purpose processor may be a microprocessor or may bea processor, a controller, a micro-controller, or a state machine ofknown type, instead. The above-mentioned electric circuit may include adigital circuit, or may include an analog circuit. Furthermore, in acase that with advances in semiconductor technology, a circuitintegration technology appears that replaces the present integratedcircuits, it is also possible to use a new integrated circuit based onthe technology according to one or more aspects of the presentinvention.

Note that, in the embodiments according to the present invention, anexample has been described in which the present invention is applied toa communication system including a base station apparatus and a terminalapparatus, but the present invention can also be applied in a system inwhich terminals communicate as in the case of Device to Device (D2D).

Note that the invention of the present application is not limited to theabove-described embodiments. Although apparatuses have been described asan example in the embodiment, the invention of the present applicationis not limited to these apparatuses, and is applicable to a stationarytype or a non-movable type electronic apparatus installed indoors oroutdoors such as a terminal apparatus or a communication apparatus, forexample, an AV device, a kitchen device, a cleaning or washing machine,an air-conditioning device, office equipment, a vending machine, andother household appliances.

Although, the embodiments of the present invention have been describedin detail above referring to the drawings, the specific configuration isnot limited to the embodiments and includes, for example, design changeswithin the scope not depart from the gist of the present invention.Furthermore, as for the present invention, various modifications arepossible within the scope of claims, and embodiments that are made bysuitably combining technical means disclosed according to the differentembodiments are also included in the technical scope of the presentinvention. Furthermore, a configuration in which elements described inthe respective embodiments and having mutually the same effects, aresubstituted for one another is also included.

1-10. (canceled) 11: A terminal apparatus comprising: receptioncircuitry configured to receive a radio resource control (RRC) messageincluding a first RRC parameter for configuring one of a firstrepetition transmission type and a second repetition transmission type;and transmission circuitry configured to transmit, on a Physical UplinkShared CHannel (PUSCH), a transport block scheduled by a downlinkcontrol information (DCI) format, wherein the transmission circuitryperforms, by applying the first repetition transmission type, arepetition transmission of the transport block base on a first number ofrepetition transmissions in a case that the first repetitiontransmission type is configured by the first RRC parameter, thetransmission circuitry performs, by applying the second repetitiontransmission type, the repetition transmission of the transport blockbase on a second number of repetition transmissions in a case that thesecond repetition transmission type is configured by the first RRCparameter, the first number of repetition transmissions is determinedbased on whether a second RRC parameter is included in the RRC messageand whether a third RRC parameter is included in the RRC message, andthe second number of repetition transmissions is determined based on thesecond RRC parameter included in the RRC message. 12: The terminalapparatus according to claim 11, wherein the first number of repetitiontransmissions is given by the second RRC parameter in a case that thesecond RRC parameter is included in the RRC message, the first number ofrepetition transmissions is given by the third RRC parameter in a casethat the second RRC parameter is not included in the RRC message and thethird RRC parameter is included in the RRC message, and the first numberof repetition transmissions is 1 in a case that the second RRC parameterand the third RRC parameter are not included in the RRC message. 13: Theterminal apparatus according to claim 11, wherein a number L ofcontinuous allocated symbols is included in the DCI format, for thefirst repetition transmission type, a symbol number of repetitiontransmissions of the transport block and the L are the same, and for thesecond repetition transmission type, the symbol number of repetitiontransmissions of the transport block and the L are different. 14: Theterminal apparatus according to claim 11, wherein for the firstrepetition transmission type, the repetition transmission of thetransport block is performed N times in continuous N slots, and for thesecond repetition transmission type, a starting symbol of Xth repetitiontransmission of the transport block is a first symbol continuous with anX−1th repetition transmission. 15: The terminal apparatus according toclaim 11, wherein for the first repetition transmission type, therepetition transmission of the transport block is performed only oncewithin one slot, and for the second repetition transmission type, therepetition transmission of the transport block is performed one or moretimes within one slot. 16: The terminal apparatus according to claim 11,wherein for the first repetition transmission type, an identical symbolallocation is applied between a plurality of the repetitiontransmissions of the transport block, for the second repetitiontransmission type, different symbol allocations are applicable between aplurality of the repetition transmissions of the transport block, andthe symbol allocation includes a symbol number of a starting symbol ofthe PUSCH on which the transport block is repeatedly transmitted, andthe number of continuous symbols. 17: A base station apparatuscomprising: transmission circuitry configured to transmit a radioresource control (RRC) message including a first RRC parameter forconfiguring one of a first repetition transmission type and a secondrepetition transmission type; and reception circuitry configured toreceive, on a Physical Uplink Shared CHannel (PUSCH), a transport blockscheduled by a downlink control information (DCI) format, wherein thereception circuitry receives, by applying the first repetitiontransmission type, a repetition transmission of the transport block baseon a first number of repetition transmissions in a case that the firstrepetition transmission type is configured by the first RRC parameter,the reception circuitry performs, by applying the second repetitiontransmission type, the repetition reception of the transport block baseon a second number of repetition transmissions in a case that the secondrepetition transmission type is configured by the first RRC parameter,the first number of repetition transmissions is determined based onwhether to include a second RRC parameter in the RRC message and whetherto include a third RRC parameter in the RRC message, and the secondnumber of repetition transmissions is determined based on the second RRCparameter included in the RRC message. 18: The base station apparatusaccording to claim 17, wherein the first number of repetitiontransmissions is given by the second RRC parameter in a case that thesecond RRC parameter is included in the RRC message, the first number ofrepetition transmissions is given by the third RRC parameter in a casethat the second RRC parameter is not included in the RRC message and thethird RRC parameter is included in the RRC message, and the first numberof repetition transmissions is 1 in a case that the second RRC parameterand the third RRC parameter are not included in the RRC message. 19: Thebase station apparatus according to claim 17, wherein a number L ofcontinuous allocated symbols is included in the DCI format, for thefirst repetition transmission type, a symbol number of repetitiontransmissions of the transport block and the L are the same, and for thesecond repetition transmission type, the symbol number of repetitiontransmissions of the transport block and the L are different. 20: Thebase station apparatus according to claim 17, wherein for the firstrepetition transmission type, the repetition transmission of thetransport block is performed N times in continuous N slots, and for thesecond repetition transmission type, a starting symbol of Xth repetitiontransmission of the transport block is a first symbol continuous with anX−1th repetition transmission. 21: The base station apparatus accordingto claim 17, wherein for the first repetition transmission type, therepetition transmission of the transport block is performed only oncewithin one slot, and for the second repetition transmission type, therepetition transmission of the transport block is performed one or moretimes within one slot. 22: The base station apparatus according to claim17, wherein for the first repetition transmission type, an identicalsymbol allocation is applied between a plurality of the repetitiontransmissions of the transport block, for the second repetitiontransmission type, different symbol allocations are applicable between aplurality of the repetition transmissions of the transport block, andthe symbol allocation includes a symbol number of a starting symbol ofthe PUSCH on which the transport block is repeatedly transmitted, andthe number of continuous symbols. 23: A communication method for aterminal apparatus, the communication method comprising: receiving aradio resource control (RRC) message including a first RRC parameter forconfiguring one of a first repetition transmission type and a secondrepetition transmission type; transmitting, on a Physical Uplink SharedCHannel (PUSCH), a transport block scheduled by a downlink controlinformation (DCI) format; and performing, by applying the firstrepetition transmission type, a repetition transmission of the transportblock base on a first number of repetition transmissions in a case thatthe first repetition transmission type is configured by the first RRCparameter, performing, by applying the second repetition transmissiontype, the repetition transmission of the transport block base on asecond number of repetition transmissions in a case that the secondrepetition transmission type is configured by the first RRC parameter,the first number of repetition transmissions is determined based onwhether a second RRC parameter is included in the RRC message andwhether a third RRC parameter is included in the RRC message, and thesecond number of repetition transmissions is determined based on thesecond RRC parameter included in the RRC message. 24: A communicationmethod for a base station apparatus, the communication methodcomprising: transmitting a radio resource control (RRC) messageincluding a first RRC parameter for configuring one of a firstrepetition transmission type and a second repetition transmission type;receiving, on a Physical Uplink Shared CHannel (PUSCH), a transportblock scheduled by a downlink control information (DCI) format; andreceiving, by applying the first repetition transmission type, arepetition transmission of the transport block base on a first number ofrepetition transmissions in a case that the first repetitiontransmission type is configured by the first RRC parameter, performing,by applying the second repetition transmission type, the repetitionreception of the transport block base on a second number of repetitiontransmissions in a case that the second repetition transmission type isconfigured by the first RRC parameter, the first number of repetitiontransmissions is determined based on whether to include a second RRCparameter in the RRC message and whether to include a third RRCparameter in the RRC message, and the second number of repetitiontransmissions is determined based on the second RRC parameter includedin the RRC message.